1. A control method for accessing a Java card object, comprising: step S 1 , interpreting and executing, by a Java card virtual machine, an applet of a current application; step S 2 , obtaining, by the Java card virtual machine, an object reference provided by a current execution instruction in the applet, obtaining a current accessing object from a preset storage area according to the object reference, and reading an current context value of the current accessing object; step S 3 , obtaining, by the Java card virtual machine, a type of the current accessing object according to the current execution instruction; if the type of the current accessing object is method invoking, going to step A 1 ; if the type of the current accessing object is a READ/WRITE object, going to step B 1 ; otherwise, going to step C 1 ; step A 1 , determining whether the current accessing object is a shared interface method invoking object; if the current accessing object is a shared interface method invoking object, going to step A 2 ; if the current accessing object is not a shared interface method invoking object, going to step B 1 ; step A 2 , determining whether a packet to which the current accessing object belongs is an active packet; if the packet to which the current accessing object belongs is an active packet, going to step S 4 ; if the packet to which the current accessing object belongs is not an active packet, prompting an exception; step B 1 , determining whether the current accessing object is prevented by a firewall or satisfied with a basic detecting condition; if the current accessing object is not prevented by the firewall or satisfies with the basic detecting condition, going to step S 4 ; if the current accessing object is prevented by the firewall or does not satisfy with the basic detecting condition, prompting an exception; step C 1 , determining whether the current accessing object satisfies with the basic detecting condition; if the current accessing object satisfies with the basic detecting condition, going to step S 4 ; if the current accessing object does not satisfy with the basic detecting condition, prompting an exception; and step S 4 , executing, by the Java card virtual machine the current executing instruction.