In order to determine the dynamic load of bucket tip when the mining machinery contact buried gas pipeline, and dynamic and static response test was carried out to reflect two action modes such as static load and impact of hydraulic backhoe excavator bucket tip dig on the pipe. Test conditions were simulated by the ADAMS Multi-body dynamics software according to the dynamic test data, in which the STEP function simulation and script control technology were combined using, and the power transfer process of excavator were translated into displacement and speed control of cylinders, then dynamic load duration curves on bucket tip for extreme conditions is obtained which excavator contact the pipe with five-teeth and one-tooth. Finally, imported the dynamic load duration curves into finite element commercial software ANSYS/LS-DYNA, and the dynamic response of pipe was analyzed, the dynamic strain response of pipe were in good agreement with field test results. The test and calculation results show that, the method in this paper to determine the bucket tip load of mining machinery which is based on the combination of test and numerical simulation is feasible, and the research will provide more accurate data support to quantitative assessment of mechanical damage of buried gas pipeline under mining machinery action.