A simulation method and a simulation device are disclosed. A simulation method according to the inventive concept is provided. A simulation method of the inventive concept may include obtaining an initial state variable and an initial reward variable detected from the semiconductor device, training an agent to output a first action variable of a reinforcement learning model based on the initial state variable and the initial reward variable; and generating a first state variable of the reinforcement learning model and generating a first reward variable, based on the first action variable, wherein the first reward variable includes a skew reward variable for rewarding a skew occurring in the semiconductor device and a duty reward variable for rewarding a duty error rate of an output signal output from the semiconductor device.