The dynamic stall process in three-dimensional(3D)cases on a rectangul wing undergoing a constant rate ramp-up motion is introduced to Provide a qualitative analysis about the onset and development of the stall Phenomenon.Based on the enhanced understanding of the mechanism of dynamic stalls,a 3D dynamic stall modelis constructed with the emPhasis oftheonset,thegrowth,andtheconvectionofthedynamic stall vortex on the 3D wing surface.The results show that this engineerlng dynajnlc stall model can simulate the 3D unsteady aerodynanlic performance appropriately.