To counter atmospheric wind-field detection system based on Fabry-Perot interferometer the model of retrieval of wind velocity and temperature is deduced. Using Zemax software, the configuration of the system is numerical simulated, and interference fringes corresponding to two wavelengths are produced. Combined with the method of the least squares fitting a round image, data processing and the wind velocity inversion are completed. And by the comparison of the theoretical values, the accuracy of fringe movement is obtained, and wind velocity error is less than 4.2%. According to temperature detection theory, the reasonable specturm files are built and ideal simulated interference rings are obtained. Atmospheric temperture can be retrieved, and the error is less than 7.5%. Results show that simulation model, retrieval theory, data analysis and processing method are feasible.