Abstract: Taking marine steam turbine oils as the research object, the four-ball testing machine, FZG gear testing machine and SRV-IV friction and wear testing machine were used to investigate its tribological performance under different "four-ball method" standard test methods and different test conditions. The qualitative analysis and Pearson coefficient regression method were adopted to study the correlation between the tribological properties of marine steam turbine oils by "four-ball method" and the evaluation results of "FZG method" and "SRV method". The results show that when the "four-ball method" is used to evaluate the anti-wear properties of marine steam turbine oils, the test load and the test machine speed are the key factors affecting the oil anti-wear performance; qualitative analysis and Pearson coefficient regression show that according to SH/T 0189-2017 standard method, when the test load is 147 N and the test machine speed is 1 200 r/min, the tribological performance of the test oil obtained by the four-ball test is significantly correlated with the results of ASTM D4172-94 and ГOST 9490-75, showing a very strong linear positive correlation with SH/T 0847-2010（SRV test）. At the same time, the bearing capacity of the test oil tested by GB/T 3142-2019 has a highly linear positive correlation with the FZG test results.

Key words: marine turbine oil, tribology performance, test method, correlation