The computing speed of electromagnetic transient model for wind power system is very slow because of its complexity. To solve this problem, a general electromechanical transient model is studied, in which there are not electrical components and high frequency switching device, and it only consists of pure mathematic calculations, is simple and has fast calculation speed. There are four parts including wind speed model, wind turbine control, generator/convertor model, and electrical control model. By comparing the simulation results of this electromechanical transient model with electromagnetic transient model in PSCAD, we found that the simulation time is reduced greatly and the results are agreeable basically, the simulation efficiency can be increased significantly at the same time guarantee the accuracy of the calculation accuracy. The electromechanical transient model provides reference model for simulation and modeling of large scale grid-connected wind farm and is of great practical value.