Abstract: As far as the rotary blade-based thread guide mechanism is concerned. Most of the rotary blades′ back and forth movement is driven by grooved drum when they are used for making threads.To design the trench curved surface of the grooved drum is the key to the design of grooved drum.A new design method of trench curved surface of grooved drum is proposed: synthetic design can be obtained according to textile technology.Several design formulas of the grooved drum are deduced.In addition,the method of selecting design parameters is given in the light of illustrative examples.This design method may be used for reference.