We put forward a scheme that the oil contamination sensor with reference route is applied in this system according to the measuring difficult on incidence light and the influences from oil color and transparency of the oil contamination sensor with single route 本文针对传统的单光路结构的入射光强测定困难、油液颜色以及透光率影响测量结果等问题,提出了利用带参考光路的监测方法来解决。