1. A method for certifying an application in an Android system, comprising the following steps of: step 1: encrypting a client application package of the application by an encryption algorithm to generate a certification information file, where the client application package corresponds to the certification information file; step 2: running a local service unit in the background of the Android system; step 3: establishing binder communication between the application and the local service unit; step 4: searching, by the local service unit, the client application package according to information sent by the application; step 5: executing step 6 if the client application package is successfully searched; otherwise, breaking off the binder communication between the local service unit and the application; step 6: reading, by the local service unit, the certification information file; step 7: certifying, by the local service unit, the certification information file; and step 8: normally running the application if the certification is successful; otherwise, breaking off the binder communication between the local service unit and the application.