Two performance evaluation methods of gasoline detergents, the simulating intake valve(L-2 ) test and the port fuel injector(PFI)bench test were introduced.The appearance feature of two categories detergents, polyisobutene amine and mannich base was given based on the L-2 test.The correlation of L-2 test with engine bench test(M111)and port fuel injector(PFI)bench test was analyzed.It is found that the increase of olefin content in gasoline can lead to the sediment increase of L-2 test.L-2 test has some correlation with engine bench test(M111)and port fuel injector(PFI)bench test.