Data traffic control method and system for mobile terminal

The invention provides a data traffic control method and system for a mobile terminal. The method includes the steps that a traffic protecting password, a control cycle and a traffic control threshold value input by a user through a preset traffic control setting interface are received, and the mobile terminal is controlled to start the traffic protecting function; when the fact that the mobile terminal gets access to a network and generates data traffic is detected, the total data traffic, generated by access to the network in the control cycle, of the mobile terminal is obtained; whether the total data traffic is larger than or equal to the traffic control threshold value is judged; if yes, the data network is turned off, and the user is reminded to input a traffic using password on a preset password inputting interface; when the traffic using password input by the user is matched with the traffic protecting password, the data network is turned on. By the adoption of the scheme, data flows can be controlled automatically, and unnecessary loss is avoided for the user.