Current atmospheric radiation transmission calculating software(ARTCS) is basically developed by Fortran. As an advanced language based on scientific computation, Fortran is feeble in interface design and human-computer interaction and so on, while Visual C++ (VC) has strong ability to realize human-computer interaction and image processing. VC and Fortran can play their respective advantages by joint programming.Joint programming of VC and Fortran, mainly based on DLL library and operating files, is not easy to extend and update. Aimed at this problem, the joint programming of VC and Fortran with the COM technology is expounded and a practical example of joint programming is given in atmospheric radiation transmission module. It is proved that the method is effective and can be widely used in the development of atmospheric correction and optical remote sensing imaging simulation system.