Abstract: A method for a java application to access an intelligent key apparatus. The apparatus comprises: a java application calling a JNI interface; obtaining a corresponding lower level interface function according to a correspondence table of a JNI interface function and the lower level interface function; converting a source parameter list of the JNI interface function into a target parameter list of the corresponding lower level interface function according to the target parameter list of the lower level interface function; calling a lower level interface; accessing an intelligent key apparatus; obtaining a returned result; and returning a value of the returned result to the java application. By means of the method in the present invention, it is not easy to obtain a source code by decompiling a java application, thereby improving the security of the java application accessing an intelligent key apparatus.