EXHIBIT 8.1

List of Subsidiaries of Qihoo 360 Technology Co. Ltd. (the “Registrant”)

As of December 31, 2011

Wholly-Owned Subsidiaries

1.Qizhi Software (Beijing) Co., Ltd., a PRC company

2.Tianjin Qisi Technology Co., Ltd., a PRC company

3.Qiji International Development Limited, a HK company

4.Qifei International Development Co. Limited, a HK company

5.360 International Development Co. Limited, a HK company

Variable Interest Entities

1.Beijing 3G3W Science & Technology Co., Ltd., a PRC company

2.Beijing Qibu Tianxia Technology Co., Ltd., a PRC company

3.Beijing Qihu Technology Co., Ltd., a PRC company

4.Qihoo 360 Software (Beijing) Co., Ltd., a PRC company

5.Shanghai Qitai Network Technology Co., Ltd., a PRC company

6.Beijing Star World Technology Co., Ltd., a PRC company

7.Chengdu Qiying Technology Co., Ltd., a PRC company

8.Qihoo Ceteng Technology Co., Ltd., a PRC company

9.Shanghai JN Network Technology Co., Ltd., a PRC company

10.Shanghai Yizhitang Information Service Co., Ltd., a PRC company

Subsidiaries of Variable Interest Entities

1.Beijing Yuan Tu Technology Co., Ltd., a PRC company

2.Chengdu 2366 Technology Co., Ltd., a PRC company

3.Shanghai Yiyi Digital Technology Co., Ltd., a PRC company