In developing the electrical method information interpretive system, the VB and Fortran mixed language programming has remarkable merits. On the one hand, we can use sufficient Fortran source codes and avoid the waste of resources. On the other hand, VB can get rid of the disadvantages of the Fortran, such as the untidy interface and unsatisfactory graphic processing function. This paper describes the transfer between VB and Fortran in detail and gives an example of mixed language programming with VB and Fortran.