The dispute between Qihoo 360 and Tencent has been around for a long time, and is vividly called the "3Q War" by the industry. This stems from the "mutual strife" between the "star products" of both parties in 2012. On September 27, 2010, 360 released its newly developed "Privacy Protector", which specifically collects whether QQ software infringes on user privacy. Subsequently, QQ immediately pointed out that 360 Browser was suspected of using pornographic websites to promote. On November 3, 2012, Tencent announced that it would stop running QQ software on computers with 360 software installed. Users must uninstall 360 software before they can log in to QQ, forcing users to "choose one of the two." For their own interests, the two companies staged a series of Internet battles from 2010 to 2014 and embarked on the road to litigation.

The two parties have filed three lawsuits with each other, and Qihoo 360 has lost the lawsuit. Among them, the monopoly case of Qihoo 360 v. Tencent was particularly eye-catching. On the morning of October 16, 2014, the Supreme People's Court ruled that QQ, a subsidiary of Tencent, did not have a dominant market position, rejected Qihoo 360's appeal, and upheld the judgment of the first instance court. . This judgment sets a judicial benchmark for monopoly cases in the Internet field.

This case, known as "the first anti-unfair competition case on the Internet", is the largest unfair competition dispute case in the Internet industry to date and has a major impact across the country. It is also the "anti-unfair competition case". In the many years since the Unfair Competition Law was promulgated, the Supreme People's Court has heard the first Internet anti-unfair competition case. The case itself has attracted the attention of all parties in the industry, users and the legal community. Some industry insiders believe that the litigation itself has promoted the creation of an innovative ecosystem for Chinese Internet companies and promoted the opening up and competition of China's market economy.