The invention discloses a method for supporting simultaneous descrambling of multiple programs and a system thereof. The method comprises the steps that a CA core processes the data of a condition receiving table and a program mapping table to notify a CA middleware to start descrambling the required data channel for receiving authorization management information and authorization control information; and the CA middleware finds a corresponding bottom data channel ID according to the index and develops the data channel for receiving the authorization management information and the authorization control information required for respective descrambling of multiple programs on the corresponding bottom data channel and sets a descrambling channel of audio and video control words. According to the method, the CA is enabled to better support application extension, and application extension has low modification influence on the CA middleware part so that the function involving multipath data processing can be more rapidly integrated and the compatibility is higher. The existing CA is enabled not to limit application extension, multiple programs can be simultaneously processed and multiple program messages can be simultaneously managed so as to be applied to multiple scenes.