Double-click the icon of the system's own audio, the light gray one, open Options → Properties, select Realtek audio input in the mixer option, then check the box in front of the microphone volume, click OK, check the box in front of "Select" in the pop-up window, then turn the volume to the maximum, open the Realtek control panel, select the mixer, and there is a right arrow in the middle of the interface. Click, turn the volume to the highest level, then click the mute red × button, you can speak into the external microphone, see if there is any sound, open the QQ chat window, select voice settings in the voice bar, select Realtek audio input and output for voice input and output, and then click OK to use it.