SECURITIES AND EXCHANGE COMMISSION
                     WASHINGTON, D.C.  20549

                            FORM S-6

 For Registration Under the Securities Act of 1933 of Securities
       of Unit Investment Trusts Registered on Form N-8B-2

A.   Exact Name of Trust:             FT 622

B.   Name of Depositor:               NIKE SECURITIES L.P.

C.   Complete Address of Depositor's  1001 Warrenville Road
     Principal Executive Offices:     Lisle, Illinois  60532

D.   Name and Complete Address of
     Agents for Service:              NIKE SECURITIES L.P.
                                      Attention:  James A. Bowen
                                      Suite 300
                                      1001 Warrenville Road
                                      Lisle, Illinois  60532

                                      CHAPMAN & CUTLER
                                      Attention:  Eric F. Fess
                                      111 West Monroe Street
                                      Chicago, Illinois  60603

E.   Title of Securities
     Being Registered:                An indefinite number of
                                      Units pursuant to Rule
                                      24f-2 promulgated under
                                      the Investment Company Act
                                      of 1940, as amended.

F.   Approximate Date of Proposed
     Sale to the Public:              ____ Check if it is
                                      proposed that this filing
                                      will become effective on
                                      _____ at ____ p.m.
                                      pursuant to Rule 487.

     The registrant hereby amends this Registration Statement  on
such  date  or  dates as may be necessary to delay its  effective
date  until  the registrant shall file a further amendment  which
specifically  states  that  this  Registration  Statement   shall
thereafter  become effective in accordance with Section  8(a)  of
the  Securities  Act of 1933 or until the Registration  Statement
shall  become  effective on such date as the  Commission,  acting
pursuant to said Section 8(a), may determine.


                  Preliminary Prospectus Dated March 19, 2002

                                     FT 622


10,000 Units                                    (A Unit Investment Trust)

         The attached final Prospectus for a prior Series of the Fund is hereby
used as a preliminary Prospectus for the above stated Series. The narrative
information and structure of the attached final Prospectus will be substantially
the same as that of the final Prospectus for this Series. Information with
respect to pricing, the number of Units, dates and summary information regarding
the characteristics of securities to be deposited in this Series is not now
available and will be different since each Series has a unique Portfolio.
Accordingly the information contained herein with regard to the previous Series
should be considered as being included for informational purposes only. Ratings
of the securities in this Series are expected to be comparable to those of the
securities deposited in the previous Series.

         A registration statement relating to the units of this Series will be
filed with the Securities and Exchange Commission but has not yet become
effective. Information contained herein is subject to completion or amendment.
Such Units may not be sold nor may offer to buy be accepted prior to the time
the registration statement becomes effective. This Prospectus shall not
constitute an offer to sell or the solicitation of an offer to buy nor shall
there be any sale of the Units in any state in which such offer, solicitation or
sale would be unlawful prior to registration or qualification under the
securities laws of any such state. (Incorporated herein by reference is the
final prospectus for FT 511 (Registration No. 333-55514) as filed on March 30,
2001, which shall be used as preliminary prospectus for the current series of
the Fund.)

                                   MEMORANDUM

                                   Re: FT 622

         The only difference of consequence (except as described below) between
FT 511, which is the current fund, and FT 622, the filing of which this
memorandum accompanies, is the change in the series number. The list of
securities comprising the Fund, the evaluation, record and distribution dates
and other changes pertaining specifically to the new series, such as size and
number of Units in the Fund and the statement of condition of the new Fund, will
be filed by amendment.


                                    1940 ACT


                               FORMS N-8A AND N-8B-2

         These forms were not filed, as the Form N-8A and Form N-8B-2 filed in
respect of Templeton Growth and Treasury Trust, Series 1 and subsequent series
(File No. 811-05903) related also to the subsequent series of the Fund.


                                    1933 ACT


                                   PROSPECTUS

         The only significant changes in the Prospectus from the Series 511
Prospectus relate to the series number and size and the date and various items
of information which will be derived from and apply specifically to the
securities deposited in the Fund.


                       CONTENTS OF REGISTRATION STATEMENT


ITEM A            Bonding Arrangements of Depositor:

                  Nike Securities L.P. is covered by a Broker's Fidelity Bond,
                  in the total amount of $2,000,000, the insurer being
                  National Union Fire Insurance Company of Pittsburgh.

ITEM B            This Registration Statement on Form S-6 comprises the
                  following papers and documents:

                  The facing sheet

                  The Prospectus

                  The signatures

                  Exhibits


                                       S-1

                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant, FT 622 has duly caused this Registration Statement to be signed on
its behalf by the undersigned, thereunto duly authorized, in the Village of
Lisle and State of Illinois on March 19, 2002.

                               FT 622
                              (Registrant)

                               By: NIKE SECURITIES L.P.
                              (Depositor)


                               By: Robert M. Porcellino
                                   Senior Vice President


                                       S-2

         Pursuant to the requirements of the Securities Act of 1933, this
Amendment to the Registration Statement has been signed below by the following
person in the capacity and on the date indicated:

          NAME                   TITLE*                      DATE

David J. Allen                   Director                 )
                                 of Nike Securities       )
                                 Corporation, the         ) March 19, 2002
                                 General Partner of       )
                                 Nike Securities L.P.     )
                                                          )
Judith M. Van Kampen             Director                 )
                                 of Nike Securities       ) Robert M. Porcellino
                                 Corporation, the         ) Attorney-in-Fact**
                                 General Partner of       )
                                 Nike Securities L.P.     )

Karla M. Van Kampen-Pierre       Director                 )
                                 of Nike Securities       )
                                 Corporation, the         )
                                 General Partner of       )
                                 Nike Securities L.P.     )

David G. Wisen                   Director                 )
                                 of Nike Securities       )
                                 Corporation, the         )
                                 General Partner of       )
                                 Nike Securities L.P.     )




       *      The title of the person named herein represents his capacity in
              and relationship to Nike Securities L.P., Depositor.

       **     An executed copy of the related power of attorney was filed with
              the Securities and Exchange Commission in connection with the
              Amendment No. 1 to Form S-6 of FT 597 (File No. 333-76518) and the
              same is hereby incorporated herein by this reference.



                                       S-3

                               CONSENTS OF COUNSEL

         The consents of counsel to the use of their names in the Prospectus
included in this Registration Statement will be contained in their respective
opinions to be filed as Exhibits 3.1, 3.2, 3.3 and 3.4 of the Registration
Statement.


                        CONSENT OF DELOITTE & TOUCHE LLP

         The consent of Deloitte & Touche LLP to the use of its name and to the
reference to such firm in the Prospectus included in this Registration Statement
will be filed by amendment.


                       CONSENT OF FIRST TRUST ADVISORS L.P.

         The consent of First Trust Advisors L.P. to the use of its name in the
Prospectus  included in the  Registration  Statement is filed as Exhibit 4.1 to
the Registration Statement.


                                    S-4


                              EXHIBIT INDEX

1.1      Form of  Standard  Terms  and  Conditions of Trust for The First Trust
         Special  Situations  Trust,  Series 22 and  certain subsequent Series,
         effective November 20, 1991 among Nike Securities L.P., as Depositor,
         United States Trust Company of New York as Trustee, Securities
         Evaluation Service,  Inc., as Evaluator,  and Nike Financial Advisory
         Services L.P. as Portfolio Supervisor (incorporated  by reference to
         Amendment No. 1 to Form S-6 [File No. 33-43693] filed on behalf of The
         First Trust Special Situations Trust, Series 22).

1.1.1*   Form of Trust Agreement for FT 622 among Nike Securities L.P., as
         Depositor,  JPMorgan Chase Bank, as Trustee and First Trust
         Advisors L.P., as Evaluator and Portfolio Supervisor.

1.2      Copy of Certificate of Limited Partnership of Nike Securities L.P.
         (incorporated by reference to Amendment No. 1 to Form S-6
         [File No. 33-42683] filed on behalf of The First Trust Special
         Situations Trust, Series 18).

1.3      Copy of Amended and Restated Limited  Partnership  Agreement of Nike
         Securities L.P.  (incorporated by reference to Amendment No. 1 to
         Form S-6 [File No. 33-42683] filed on behalf of The First Trust
         Special Situations Trust, Series 18).

1.4      Copy of Articles of Incorporation  of Nike Securities  Corporation,
         the general partner of Nike Securities  L.P.,  Depositor (incorporated
         by reference to Amendment No. 1 to Form S-6 [File No. 33-42683]
         filed on behalf of The First Trust Special Situations Trust,
         Series 18).

1.5      Copy of By-Laws of Nike Securities  Corporation,  the general partner
         of Nike Securities  L.P.,  Depositor  (incorporated  by reference to
         Amendment No. 1 to Form S-6 [File No. 33-42683] filed on behalf of The
         First Trust Special  Situations  Trust, Series 18).

2.1      Copy of Certificate of Ownership (included in Exhibit 1.1 filed
         herewith on page 2 and incorporated herein by reference).

2.2      Copy of Code of Ethics (incorporated by reference to Amendment No. 1
         to form S-6 [File No. 333-31176] filed on behalf of FT 415).

3.1*     Opinion of counsel as to legality of Securities being registered.


                                       S-5

3.2*     Opinion of counsel as to Federal income tax status of Securities being
         registered.

3.3*     Opinion of counsel as to New York income tax status of Securities
         being registered.

3.4*     Opinion of counsel as to advancement of funds by Trustee.

4.1*     Consent of First Trust Advisors L.P.

6.1      List of Directors and Officers of Depositor and other related
         information  (incorporated  by reference to Amendment No. 1 to
         Form S-6 [File No. 33-42683] filed on behalf of The First Trust
         Special Situations Trust, Series 18).

7.1      Power of Attorney executed by the Directors listed on page S-3 of this
         Registration  Statement (incorporated by reference to Amendment No. 1
         to Form S-6 [File No. 333-76518] filed on behalf of FT 597).

- -----------------------------------
* To be filed by amendment.

                                       S-6