The present invention provides a method and system for improving playing quality of a mobile TV to address the technical problem that the playing quality of a mobile TV is influenced by network coverage discrepancies of a mobile TV. In the present invention, a terminal detects the network signal intensity of a mobile TV, performs a match determination between the network signal intensity and the data rate of the mobile TV, and requests a mobile TV service platform to dynamically adjust the program data rate of the mobile TV according to the result of the match determination. In this way, the present invention improves the playing quality of the programs of the mobile TV, and enables the user to enjoy programs of the mobile TV satisfactorily in different mobile TV network environments.