Free viewpoint video（FVV） realizes the user’s " Director dream" and greatly enriches the video experience by providing the user with features such as 360 ° rotating viewing/dynamic 360 ° time solidification.This paper introduces the development process of interactive video

the progress of FVV standardization and typical FVV systems（system architecture

network composition and user experience requirements）

focuses on the quantitative research on the response delay and network requirements of user independent switching viewpoint

and finally summarizes the main research results.