Abstract: The power system simulation software is an important tool for programming,research,operating and teaching of the power system.BPA(Bonneville Power Administration) in Chinese copyright has many traits,such as,complete models,strong functions,flexible uses and convenient operation.Especially,it adapts to the simulation of large scale AC/DC power system.It introduces BPA from the aspects of mathematical models,software functions,input and output.It sets out the functions of BPA by the simulation ba...