The experimental performances of rotating stall in the blade row of altered geometric parameters are analyzed by use of the flow model and the method providedin Ref.(1). The tendencies that the performances of rotating stall vary with the stagger angles and the solidities are observed. All of blockage ratio

the performance loss and the hysteresis in stall rise with the increase of the stagger angles and the solidities. Both blockage ratio and performance loss in stall for a stage are larger than those for an isolated rotor

but the hysteresis effect of the stage is weakened due to the presence of the stator. The flow model with the active cell structure is discussed and evaluated on the basis of analyzing experimental data. The results show that the features of the active cell model should involve two atpects: (l)the mass interchange between the stall flow region and the unstall one as well as between the stall cells from the outlet to the inlet of the blade row; ( 2 ) the momentum interchange in the tangential direction of the rotor between the fluid in the stall cell and the rotor.