[- # - PART I INFORMATION REQUIRED IN PROSPECTUS Item - 1. Description of Securities to be Registered Cross Reference Sheet Item Number and Caption Filed Herewith as Prospectus Location in Form of Receipt 1. Name and address of depositary Introductory Article 2. Title of American Depositary Receipts and identity of deposited securities Face of Receipt, top center Terms of] [TABLE OF CONTENTS ARTICLE 1. DEFINITIONS 2 SECTION 1.01 American Depositary Shares. 2 SECTION 1.02 Commission. 3 SECTION 1.03 Company. 3 SECTION 1.04 Custodian. 3 SECTION 1.05 Deliver; Surrender. 3 SECTION 1.06 Deposit Agreement. 4 SECTION 1.07 Depositary; Corporate Trust Office. 4 SECTION 1.08 Deposited Securities. 4 SECTION 1.09 Dollars. 4 SECTION 1.10 DTC. 4 SECTION 1.11 Foreign Registrar. 4]

[Amendment No. 2 to FORM F-1 REGISTRATION STATEMENT Qihoo 360 Technology Co. Ltd. Cayman Islands 7371 Not Applicable (State or Other Jurisdiction of (Primary Standard Industrial (I.R.S. Employer Block 1, Area D, Huitong Times Plaza Corporation Service Company (Name, address, including zip code, and telephone number, including area code, of agent for service) Copies to: st David T. Zhang, Esq.] [QIHOO 360 TECHNOLOGY CO. LTD. (a Cayman Islands exempted limited liability company) 12,110,800 American Depositary Shares Every Two Representing Three Class A Ordinary Share (Par Value US$0.001 Per Class A Ordinary Share) UNDERWRITING AGREEMENT [ ], 2011 UBS AG and Citigroup Global Markets Inc. as Representatives of the several Underwriters Ladies and Gentlemen: Company Underwriters Representatives ADSs Class A Ordinary] [TABLE OF CONTENTS ARTICLE 1. DEFINITIONS 2 SECTION 1.01 American Depositary Shares 2 SECTION 1.02 Commission 3 SECTION 1.03 Company 3 SECTION 1.04 Custodian 3 SECTION 1.05 Deliver; Surrender 3 SECTION 1.06 Deposit Agreement 4] [CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the use in this Registration Statement on Amendment No. 2 to Form F-1 of our report dated March 1, 2011, except for Note 23, as to which the date is March 14, 2011 relating to the consolidated financial statements of Qihoo 360 Technology Co. Ltd. (formerly known as “Qihoo Technology]

[Amendment No. 1 to FORM F-1 REGISTRATION STATEMENT Qihoo 360 Technology Co. Ltd. Cayman Islands 7371 Not Applicable (State or Other Jurisdiction of (Primary Standard Industrial (I.R.S. Employer Block 1, Area D, Huitong Times Plaza Corporation Service Company (Name, address, including zip code, and telephone number, including area code, of agent for service) Copies to: st David T. Zhang, Esq.] [QIHOO 360 TECHNOLOGY CO. LTD. March 14, 2011 TB ALTERNATIVE ASSETS LTD. HIGHLAND VII - PRI (2) S.à r.l. HIGHLAND VIIB - PRI (2) S.à r.l. HIGHLAND VIIC - PRI (2) S.à r.l. HIGHLAND ENT VII - PRI (2) S.à r.l. Highland Entities (collectively, the “ SEQUOIA CAPITAL CHINA I, L.P. SEQUOIA CAPITAL CHINA PARTNERS FUND I, L.P. SEQUOIA CAPITAL] [REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT Agreement (this “ , 2011 by and among Company Qihoo 360 Technology Co. Ltd., a company incorporated under the laws of the Cayman Islands (the “ Schedule A Investors and the persons listed in . RECITALS A. Subscription Agreement The Company and the Investors have entered into a subscription agreement dated as of] [CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the use in this Registration Statement on Amendment No. 1 to Form F-1 of our report dated March 1, 2011, except for Note 23, as to which the date is March 14, 2011 relating to the consolidated financial statements of Qihoo 360 Technology Co. Ltd. (formerly known as “Qihoo Technology]