The invention provides a network streaming content playing method and system. The method comprises the following steps of: firstly, obtaining a file size of a corresponding streaming content by a server, detecting a downloading rate of the streaming content downloaded between the server and an electronic device and provided by the server; calculating a downloading time of the corresponding streaming content according to the file size and the downloading rate; then obtaining a system playing rate of the electronic device and calculating a smooth playing time point of the corresponding streaming content according to the downloading rate, the downloading time and the system playing rate; and further prompting the smooth playing time point of the corresponding streaming content through an interface.