The invention provides a synchronous method for dormancy awakening. The synchronous method comprises the following steps: searching a current network by a mobile terminal; calculating a dormancy period and an awakening time point of a communication module according to the searched current network and a parameter of the mobile terminal; setting the dormancy period and the awakening time point of the communication module according to the calculated dormancy period and the calculated awakening time point of the communication module; and setting a dormancy period and an awakening time point of an application processing module according to the dormancy period and the awakening time point of the communication module. According to the invention, the awakening time point and the dormancy period of the application processing module are aligned to the dormancy period and the awakening time point of the communication module; therefore, complete synchronization of the application processing module and the communication module in the dormancy is kept; and thus, the purpose of best saving the power consumption can be achieved.