Bimetallic composite bearings are made of high-quality low-carbon steel as the substrate, and copper alloys with low friction characteristics (CuPb10Sn10, CuPb6Sn6Zn3, CuPb24Sn4, CuPb30, AlSn20Cu, CuSn8Ni) are sintered on the surface as the wear-resistant layer of the bearing. The surface of the copper alloy can be machined with various types of oil grooves, oil holes, oil cavities, etc. according to the needs of the operating conditions, suitable for situations where continuous or difficult refueling is not possible.