A method for access control of a multimedia system to a secure system, comprising: a secure service request step for initiating an application access request for selecting a trusted application from a client application of a multimedia system to a secure operating system; an access right decision step for making a decision as to whether the client application that initiates an invocation is a malicious application, and if the client application is not decided to be a malicious application, proceeding to an application request sending step, and if the client application is decided to be a malicious application, returning Selection Failure to the client application and performing an interrupt handling; the application request sending step for sending the application access request from the multimedia system to the secure operating system; and an application acquiring step for acquiring a trusted application and returning the trusted application to the multimedia system based on the application access request at the secure operating system, wherein the access right decision step comprises the sub-steps of: querying a malicious application registry stored in the multimedia system based on an application identification of the client application, and deciding whether the client application is a malicious application based on the application identification, wherein in the step of application acquiring step, the multimedia system acquires the trusted application selection result, deciding whether the client application is a malicious application based on a rule condition prestored therein, and if the client application is decided to be a malicious application, the client application is registered into the malicious application registry. a secure service request step for initiating an application access request for selecting a trusted application from a client application of a multimedia system to a secure operating system; an access right decision step for making a decision as to whether the client application that initiates an invocation is a malicious application, and if the client application is not decided to be a malicious application, proceeding to an application request sending step, and if the client application is decided to be a malicious application, returning Selection Failure to the client application and performing an interrupt handling; the application request sending step for sending the application access request from the multimedia system to the secure operating system; and an application acquiring step for acquiring a trusted application and returning the trusted application to the multimedia system based on the application access request at the secure operating system, wherein the access right decision step comprises the sub-steps of: querying a malicious application registry stored in the multimedia system based on an application identification of the client application, and deciding whether the client application is a malicious application based on the application identification, wherein in the step of application acquiring step, the multimedia system acquires the trusted application selection result, deciding whether the client application is a malicious application based on a rule condition prestored therein, and if the client application is decided to be a malicious application, the client application is registered into the malicious application registry.