A triple Fabry-Prot etalon for wind lidar is developed. The relative thicknesses of the etalon measured by using the interference fringe with the He-Ne laser are 74.70±2.24 nm and 27.16±1.90 nm. The corresponding separation of two edges etalon and that between edge1 etalon and locking etalon are 5.05±0.07 GHz and 1.79±0.70 GHz,respectively. The etalon as a frequency discriminator,a laser with the push energy of 350 mJ at wavelength 355 nm,repetition frequency of 30 Hz and a telescope with the diameter of 450 mm are used) to simulate the wind lidar. As a result,the actual line-of-sight wind speed error is lower than 2.53 m/s,the accuracy of line-of-sight wind is improved by 14.1% compared with the theoretical value of 2.94 m/s at the altitude of 0-40 km.