The judgment of “Sina sued Maimai” case has attracted social attention, and it has exposed the problems of ISP liability system in personal information protection in the era of big data. The case is the touchstone of the current situation of personal information protection in China, which can promote the reflection of the defects of ISP responsibility system and its improvement. However, it can be found after studying the concept and development trend of personal information protection in foreign countries, china's protection of personal information is still stuck in the traditional concept of personal information protection and system. In the future, the construction of personal information protection system should focus on the use of personal information, to strengthen the responsibility of the ISP system.