[FORM OF JOINT FILING AGREEMENT [Remainder of Page Intentionally Left Blank] IDG-ACCEL CHINA GROWTH FUND II L.P. IDG-ACCEL CHINA GROWTH FUND II ASSOCIATES L.P. IDG-ACCEL CHINA INVESTORS II L.P. IDG-ACCEL CHINA GROWTH FUND GP II ASSOCIATES LTD. CHI SING HO] [Execution Copy CONSORTIUM AGREEMENT Agreement Chairman Right Advance Chiming Bells Chairman Holding Companies Chairman Parties IDG Growth II IDG Investors II IDG Sponsors Party Parties THIS CONSORTIUM AGREEMENT is made as of Transaction Target Exchange Act WHEREAS, the Parties intend to undertake an acquisition transaction (the “ Holdco WHEREAS, in connection with the Transaction, the Parties propose to form a] []