Abstract: In order to prove that X-ray inspection method is effective for wall thickness measurement of aero-engine turbine blade, we make special fixed blade tool to ensure the perpendicularity between X-ray beam and measurement point of turbine blade. Through the wall thickness measurement for the turbine blade surface where curvature radius smaller than 3 mm, and also through the analysis and comparison with ultrasonic measurement or metrology results, the veracity and feasibility of X-ray measurement results were proved, pointing out that wall thickness measurement method for maximum curvature of aero-engine turbine blade based on X-Ray was effective.