IMC (SIMD C) is a SIMD(single instruction multiple data) parallel programming language extended to the syntax of usual C language. SIMC can be easy to program SIMD algorithms. Moreover, it can be used to study SIMD algorithms on differentkinds of SIMD architecture which is defined in SIMC. The simulation environment ofSIMC has been implemented on a sequential computer. This environment can be used toevaluate the performance of SIMD s algorithms and architecture.