In order to accurately detect and measure the energy consumption of marine diesel engine cylinder lubricating oil and improve the economy of marine diesel engine, a cylinder oil injection control system and a test device were designed. Through orthogonal test and single factor test, the influence law of each factor on flow rate was found out. The results show that the speed of gear pump has the greatest influence on the flow rate, the diameter of pipe is the second, and the temperature of lubricating oil is the third. With the increase of gear pump speed and pipe diameter, the flow rate increases. When the oil temperature is 30~32 ℃, the oil temperature is the inflection point, the oil temperature continues to rise, the flow rate begins to decrease, and the flow rate is the smallest at 67~70 ℃.When the speed of gear pump is 180 r/min, the diameter of pipe is 6 mm, and the oil temperature is 30~32 ℃, the maximum injection rate is 47 mL/ min.