Abstract: The paper presents a numerical method for computing the viscous incompressible steady laminar flows in turbomachinary. The fundamental equations governing the viscous incompressible　flows in the rotating coordinate system are obtained. The numerical solution is obtained by　iterative computation of the pressure gradient equation, which is satisfied in the direction of　arbitrary curved line. The computational method and steps are described in detail and the numerical computation is made for some channal. The computational results shows that the present method is simpler and available.