Abstract: In this paper,a practical model for measuring and calculating the suck rod pump system efficiency is developed.The efficiency analyse and research has been made with this model in three low permeability oilwells at T114 oil block of Yanchang Petroleum Group.Based on the data of oil well and polish rod indicator diagram,the polish rod power,water power,ground efficiency,underground efficiency and system efficiency can be calculated.Using the method of optimal swabbing parameters(such as increasing the length of stroke and decreasing the pumping speed and pump diameter appropriately),the average efficiency of three oil wells has been improved 4.8%without altering daily output.And the average energy saving rate reaches 44.5%.Research shows that this method and model are feasible,which can make energy saving and consumption reducing.