Abstract: The visual simulation of the mixer is analyzed by using the LTspice software. The influence of the different parameters such as static operating point, local oscillator voltage amplitude and load resistance on the output of intermediate-frequency signal is studied by changing the circuit component parameters outside of crystal triode. The curves of parameters and observed values are obtained directly by changing the waveform coordinate system, illustrating the effects of parameters together with the time domain waveform on performance indicators. The simulation experiment can vividly and intuitively display simulation results, enhance students' perceptual understanding of abstract indicator and the method to debug parameters of circuit performance, and deepen students' understanding of basic principles. The practice indicates that this visual simulation teaching method is beneficial to display the teaching contents from multiple coordinate systems, enhance interest in learning and improve learning effect.