A structural scheme of novel small flow and multi-lubricating oil pump is presented which employed the plunger pump to supply oil accurately and the character of gear and cam transmission.The pump has integrated the gear and cam by designing the gear end with sector and the transformation from rotation of gear to linear motion of plunger is realized.The method for the flow analysis is stated theoretically and the flow of the pump can be calculated according to the number of oil outlet.The laws of the plunger motion

the chamber change and the flow curve of a lubricating oil pump are analyed.It provides the theoretically reference to the lubrication oil pump.