When the power supply is in poor contact, it can be reconnected. If the service life of the headlight is reached, replace it in time. The following is an analysis of the specific situation: 1. Poor power contact: if the headlight suddenly does not light up, you can go to the front of the car and knock on the lampshade of the light that does not light up. If the headlight can light up instantaneously, it is sure that the socket is not in good contact. At this time, as long as you unplug the power cord socket of the headlight and plug it back in, the problem can be solved. 2. Service life: if the service life of the bulb is reached, such as the bulb failure of the low beam lamp, it is not allowed to drive by force. Although you can drive with high beam, it will cause a lot of trouble to the opposite vehicle. At this time, adhesive tape can be pasted on the upper part of the lamp shade of the headlamp, and the upper part of the lamp shade can be covered by about 1 / 3 with adhesive tape. Then replace the headlight in time.