Abstract GRIX system, which is a visual programming system specified for interprocessor communications in parallel computing, is proposed in this paper. In general, the scheduling of interprocessor communications during constructing parallel programs is the most difficult and important job in order to realize its high performance. GRIX brings users easy scheduling and intuitive realization of interprocessor communications because of its GUI based operations. Moreover, by automatic code generation by GRIX system, users do not need to know about the specifications of parallel programming like PVM and MPI. All of users have to know is the rules of figured images and operations on the GRIX window. The system outline and ,especially, its GUI based operations are described in this paper.