95 connecting rod is an important part of 95 series diesel engine, in order to evaluate the reliability of its connecting rod, the stress and processing error analysis of the connecting rod is first analyzed by finite element and electrical measurement technology, and the mean value and standard deviation of the working stress are determined. Then, the fatigue test of the lifting method of the connecting rod was carried out with the load as the controlling factor. Experiments show that the fatigue strength of the connecting rod conforms to the Weibull distribution, and three distribution parameters are obtained. Finally, the reliability theory is used to discuss the failure probability of connecting rods. After analysis and calculation, the rated load of 3 connecting rod is far lower than the minimum fatigue strength, the probability of failure is zero under normal circumstances, and it has sufficient fatigue strength reserve, which can meet the requirements of diesel engine to increase speed and improve performance, which shows that it is feasible to use the lifting method to find the fatigue strength of components and its distribution law, and it is a reliable and effective method.