Abstract: To investigate the aerodynamic characteristics under the different incidences of original and modified designed high pressure static cascades used in the 9th stage of 600MW subcritical steam turbine,the two types of annular turbine cascades were studied in the low speed wind tunnel of HIT under the 0°and ±10°incidences.The test results show that the different incidences only effected on the transverse pressure gradient near the front half part of the flow passage of two cascades,the flow near the rear half part of passage was almost not changed.And compared with the original designed cascade,the modified designed cascade not only reduced the flow loss,but also had the better incidence adaptability.