1、UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWASHINGTON,D.C.20549FORM 20-F(Mark One)Date of event requiring this shell company report.Commission file number:001-36430?REGISTRATION STATEMENT PURSUANT TO SECTION 12(b)OR 12(g)OF THE SECURITIES EXCHANGE ACT OF 1934OR?ANNUAL REPORT PURSUANT TO SECTION

2、13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31,2015.OR?TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period from toOR?SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT

3、 OF 1934Tuniu Corporation(Exact name of Registrant as specified in its charter)N/A(Translation of Registrants name into English)Cayman Islands(Jurisdiction of incorporation or organization)Tuniu Building No.699-32Xuanwudadao,Xuanwu DistrictNanjing,Jiangsu Province 210042The Peoples Republic of China

4、(Address of principal executive offices)Securities registered or to be registered pursuant to Section 12(b)of the Act.Securities registered or to be registered pursuant to Section 12(g)of the Act.Securities for which there is a reporting obligation pursuant to Section 15(d)of the Act.Indicate the nu

5、mber of outstanding shares of each of the issuers classes of capital or common stock as of the close of the period covered by the annual report.269,597,392 Class A ordinary shares(excluding 1,851,561 Class A ordinary shares,represented by American depositary shares,issued and reserved for the future

6、 exercise of options or the vesting of other awards under the 2008 Plan and the 2014 Plan)and 17,373,500 Class B ordinary shares,par value US$0.0001 per share,as of December 31,2015.Indicate by check mark if the registrant is a well-known seasoned issuer,as defined in Rule 405 of the Securities Act.