Based on the inside-laser powder feeding technology,the normal stratified path planning, and the high-level measurement system, the closed-loop control of laser cladding forming of fan-shaped unequal-height parts is conducted. A new method of hierarchical and segmented control is proposed, which ensures the width of forming parts consistency. The speed proportion-integration (PI) controller is established, which ensures that the actual heap reaches the desired value, and the high precision forming of structural parts is realized.