The year 2021 is the opening year of the 14th Five-Year Plan. The development of China’s online advertising market scale has progressed steadily，the demand for advertising consumption has entered a customized society，the concept of interconnection and ecology has promoted the change of advertising，anti-monopoly and platform governance have caused platform advertising to enter a period of adjustment pain，and the advertising industry has gone abroad to form international communication influence. At the same time，Apple’s system upgrade and major changes in IDFA’s privacy policy have made China’s advertising industry face multiple disturbances，and green consumption and advertising governance have a long way to go. In order to build a new pattern of online advertising development，it is advisable to deepen the market-oriented strategy，strengthen the rule of law，promote international layout and build digital depth.