With the hypothesis that one fluid element moves along a curved average streamline in cascade passage due to the pressure force acting on the element

a feasible planar cascade inverse design method was introduced;the design parameters for yielding desired cascade geometry mainly include: inlet/outlet flow angles

section radius

prescribed profile loading and thickness distribution along axial chord.To supplement and improve original design method

a new theory was put forward

in which the density distribution along axial chord could be calculated

and the algorithm with leading/trailing circles was modified with obvious improvement of cascade aerodynamic performance.To validate the improved cascade design method

the Aachen turbine cascade from Germany was re-designed in this paper.