Abstract: Development of courseware has become a bottleneck against the evolement and generalization of CAI(Computer Aided Instruction).It is one of the effective way to research and develop courseware authoring system in order to improve courseware productivity and quality.Multimedia courseware authoring system which combines multimedia technology and computer aided instruction gives users an effective authoring environment.This paper gives the construction of one multimedia courseware authoring system(FA MCAS),including the design and implication.