The principles of laser Doppler effect and telemetry were introduced

and the requirement for the size of aerosol particles was analyzed. A low wind velocity measurement system was established

and through which the measurement accuracy and influence of installation angle were analyzed. The experiments of rotary table

linear guideway and wind tunnel were carried out. The results verified the analysis and proved that the measurement accuracy was better than 001 m/s by experimental data. The measurement system can obtain stable and reliable signal when the medium in wind tunnel was conventional air

and the measurement results were very close to the high-performance instrument.