The tracer particles selecting and sowing was very important in PIV technology ap-plied to blow-down and high subsonic plane cascade flow field measurement.In this paper,tracer partides flow was effectively mixed with the main flow by using high pressure atomized particle generator and broadcaster installed in front of the steady pressure section,and we successfully obtained 2-D velocity fields of a compressor cascade channel and wake at zero incidence angle and inlet Mach number from 0 .2 to 0 .8 .In order to validate reliability of PIV results in the cascade flow field,the PIV results were compared with the results of the numerical simulation and three hole wake probe in the same aerodynamic conditions.The results indicated that 2-D velocity vec-tor field acquired by the PIV was closer to the numerical simulation results,and reasonably re-flected the flow structure of the blade passage;the PIV data got good agreement with the three hole wake probe data in the aspect of the velocity magnitude and flow angle at mainstream area of the cascade outlet.But the coincidence of flow angle at wake separation area was slightly bad. The main reason was that the flow angle in this area was beyond the scope of probe calibration. In addition,in order to obtain accurate PIV measuring results,it was very important to avoid contamination of the tracer particles to the window during the measurement.PIV measurement technique proposed in this paper could also be used for continuous cascade wind tunnel.