Trochoidal parametric equation was formulated.Based on CAM/HSM technology,Trochoidal tool path was applied to high speed milling slot experiments.Milling force,surface roughness and local surface morphology were measured,observed and studied comprehensively.An analytical milling force model was defined depending on the study of milling force.The results indicated that trochoidal tool path in high speed milling slot is effective and feasible,and a high-quality slot surface(Ra=0.142 μm) is obtained.The milling force of trochoidal tool path is varied periodically.In the milling plane,the cutting force in trochoidal width direction is quadrupled to the width of trochoidal step ahead.Introduce circumferential cutting tool path to trochoidal peripherally,not only improved the slot of milling condition,but also meet the high speed milling of rough milling and finishing requirement.