System and method for beforehand downloading video

A system for beforehand downloading video, executed in a video server coupled to multiple client devices and accessed though the multiple client devices by different users, the system comprising:

• at least one processor;
• a database coupled to the at least one processor;
• and
• a storage unit coupled to the at least one processor, the storage unit configured to store one or more programs that are executed by the at least one processor, the one or more programs comprising instructions for:
• detecting a switching action of the users of each client device to add up information of each switching action as subsection statistic information;
• calculating a piecewise spot of the selected video according to the subsection statistic information of the selected video after receiving a request of a specified user for playing a selected video;
• and
• controlling the video server to transmit a video streaming behind the beginning of the selected video and the video streaming behind each piecewise spot of the selected video to the client device of the specified user at the same time.