Abstract: The goal of this article is to present a measuring system which is fast and simple to be applied for the middle or large scale production of semiconductor lasers.The simulation is performed to the near field pattern,far field pattern and divergence angle etc.of the semiconductor laser with the finite difference analysis.A measuring system is built to measure the characteristics.Finally,the experimental system error is analyzed,and an approach to cut down the error is presented.Compared with other methods,this measuring system is simple,fast and precise.