With the complexity of new products and devices increasing, the scheduling of semiconductor assembly and test producing line becomes more and more complicated. To deal with the problems of complex operation, low efficiency, high workload and unsatisfactory scheduling results in making plan, we develop a scheduling platform. This paper analyzes the features of the semiconductor assembly and test producing line, and builds the system from function design and database construction. At last, it presents the application of the system. Now the platform has successfully applied in a certain large semiconductor production enterprise. It helps schedulers make the scheduling more accurately and more conveniently; the scheduling results also can be supported for further decision-making clearly.