construction machinery hybrid power system test bench is developed to research hybrid power system electro-mechanical coupling characteristic and power system shafts vibration characteristic, which is composed of diesel engine, motor and hydraulic pump with coaxial connecting. The control system of test bench is composed of industrial control computer, PCI bus control card and configuration soft. The number and type of control system input signal and control signal are introduced. Design principle and developing process of measurement and control system control strategy are analyzed. With placing three acceleration transducers at end face of diesel engine, vibration performance of diesel engine crankshaft can be measured. Vibration performance tests of diesel engine with different load power are carried out. Experimental results show that the vibration energy of diesel engine is focus on radial, vibration energy of axial can be ignored, control system of test bench can realize performance tests of hybrid power syste mshafts vibration.