In order to develop a fiber laser simulation software, which is domestic, interface friendly, easy to use, and instructive in research and industry design, the development and the research for fiber laser simulation software are carried out. Based on the theory study about fiber laser, we develop a software named See Fiber Laser which can be used to the simulation of Yb3+ doped high power fiber laser, and a fiber laser tool collection named SFTool which can be used to calculate the related parameters in fiber laser is developed. Some parts of theory models, basic function and sample calculate examples of the software are introduced. The study may make the research and the design of fiber laser easier.