Bearing is one of main friction pairs of engine, and its lubrication performance has an important influence on working condition of the engine. Small end bearing of connecting rod, which connects piston and connecting rod directly, has great effect on lubrication property of engine. At first, this paper analyses the movement and stress of the bearing and finds out the nodus of the bearing lubrication. The emphasis is on what working condition can make the bearing have better lubrication properties...