Research purposes: In order to investigate the load spectrums of isolator of the continuous floating slab (CFS) track and provide the basis for the fatigue analysis and tests of the isolator, the floating slab track-vehicle coupled dynamic model is formulated based on the vehicle-track coupled dynamic theory. In the model, the elastic deformation of slab track, track irregularities and the ... [Show full abstract] nonlinear characteristics of isolator, wheel/rail interface and the suspension system are taken into consideration. The dynamic load of isolator as the passing of vehicle was calculated with the model. Research conclusions: (1) The results show that the load peaks of isolator are increasing linearly with the vehicle load. Train speed affects only the isolator load time, no significant effects on peak load values. (2) The isolator load spectrum was draw up as one train passing, the main parameters Pi (i=0~3) of load spectrum was obtained by coupling dynamics simulation under the different train load condition. (3) The simplified algorithm of load spectrum parameters was proposed. Compared with the coupling dynamic model, the results obtained through the simplified method show 1% difference in force P1, and 10% and 27% differences in the forces P2 and P3. (4) The research results can be used for fatigue test and fatigue analysis of isolator of the continuous floating slab vibration. © 2016, Editorial Department of Journal of Railway Engineering Society. All right reserved.