Abstract: The Additional Mass Method（AMM） has been gradually applied in the study of compaction quality testing techniques for rockfill because of its efficient, accurate and non-destructive characteristics. In this paper, the test parameters and the accuracy of different inversion models of the additional mass method for testing the compacted density of rockfill are investigated, and the optimized test parameters for testing the density of rockfill are obtained. Firstly, the stiffness correlation model（SCM）, phase angular frequency correlation model（FCM） and digital template model（DTM） are established at the test site according to two inversion methods, namely correlation method and contour method, and then the application effect of each inversion model is evaluated at the rockfill dam compacting construction site. With the experiment, the model samples are expanded, and the sample mean errors and inversion relative errors before and after the expansion are analyzed.The results show that the additional mass method has a promising application in rockfill dam compacted density testing, the optimized field test parameters are highly feasible in application, the inversion results of all three models meet the accuracy requirements, among which DTM has the best application in rockfill density testing of panel rockfill dams in the Wuyue Pumping and Storage Project, and the inversion accuracy of the dry density of rockfill compaction is the highest.