Abstract: In order to observe the throughflow design of compressor under the influence of bleeding flow,a bleeding model was set based on the circumference bleeding slot.Bleeding was considered in the throughflow design of compressor by changing the endwall no-slip-boundary condition of bleeding flow area into the velocity law of endwall for the new bleeding boundary condition.A comparative research between the bleeding and non-bleeding throughflow field and 3-D numerical analysis of a two-stage compressor show that,the bleeding model and its throughflow design method can reflect the influence of bleeding parameters as a result of the throughflow calculation.Furthermore,the bleeding model and its throughflow design method can also accurately reflect the change of bleeding with the local flow condition of bleeding flow area.