In order to teach students more intuitively the phenomenon of race-hazard in combinational logic circuits, this study builds a simulation module circuit based on Proteus simulation software, and carries out simulation experiments to test the generation and elimination of circuit race-hazard. The simulation interface clearly displays the peak pulse of race-hazard, as well as the elimination results. Through this simulation module circuit, students not only observe the process of race-hazard more intuitively, but also can take different measures to eliminate circuit race-hazard. Teaching practice shows that the simulation module circuit provides a new scene for students to learn and understand the race-hazard phenomenon, thus improving the teaching effect.