VNET (VNET) SC 13D/A 21Vianet Group, Inc.

EXHIBIT 1

JOINT FILING STATEMENT

I, the undersigned, hereby express my agreement that the attached Schedule 13D (and any amendments thereto) relating to the ownership by each of the undersigned of ADS of 21Vianet Group, Inc. is filed on behalf of each of the undersigned.

Dated: May 15, 2015

GRANITE GLOBAL VENTURES III L.P.
GGV III ENTREPRENEURS FUND L.P.
BY: GRANITE GLOBAL VENTURES III L.L.C.
ITS: GENERAL PARTNER
By:	/s/ Hany M. Nada
	Hany M. Nada
	Managing Director
GRANITE GLOBAL VENTURES III L.L.C.
By:	/s/ Hany M. Nada
	Hany M. Nada
	Managing Director
	/s/ Hany M. Nada
Hany M. Nada as Attorney-in-fact for Scott B. Bonham
	/s/ Hany M. Nada
Hany M. Nada
	/s/ Hany M. Nada
Hany M. Nada as Attorney-in-fact for Thomas K. Ng
	/s/ Hany M. Nada
Hany M. Nada as Attorney-in-fact for Jixun Foo
	/s/ Hany M. Nada
Hany M. Nada as Attorney-in-fact for Glenn Solomon
	/s/ Hany M. Nada
Hany M. Nada as Attorney-in-fact for Jenny Lee

15.