Abstract: Taking the lubrication system of a new 1000MW unit as an example,a dynamic simulation model of steam turbine lubricating oil system is established according to the characteristic equations and design parameters of main and auxiliary oil pumps,pipelines,accumulators,valves,bearings and other components.Based on test data,steady-state condition calibration is carried out for the model above to verify the reliability of the simulation model.The steady-state model data are used to conduct system dynamic simulation test,and the pressure and flow changes of each node of the lubricating oil system are analyzed respectively under different working conditions during the startup,the switching of the main and auxiliary oil pumps and the failure of the filter screen of the lubricating oil system.And the variation rules of system parameters under different working conditions are obtained by quantitative means.The results show that the simulation model has high simulation accuracy,the simulation data are basically consistent with the test data,and the calculation accuracy of the simulation model can meet the requirements of the system design which can provide certain reference for the design of high power and high parameter turbine unit lubrication system and the safe operation of turbine unit.