This paper presents a microcomputer implementation of matrix computation software--MATLAB-PC (which is transplanted from its VAX version). The applications to control System theory are dealt with and several algorithms are offered with their MATLAB-PC implementations. The functions and usage of MATLAB-PC are briefly described in the appendices. It concludes that MATLAB is a powerful software for computer aided control System's design and analysis as well as System simulation and identification. The programming method is easy to learn.