The first computer based on the obtained image information to determine whether the system is collected in the liquid level oil sight glass level as the liquid state and, if the head deviates from the state of the system, the system also gives the control strategy to drive the motor , driven lens shift, in the oil level gauge shortest possible time so that the whole system depends on the state level to reach. In this paper, based on the motor oil level sight glasses control scheme PID algorithm, which by analysis module and a control module of two parts.