The dynamic characteristics of multi-mixed air-floating raft isolation equipment combined with rotor-bearing system are mainly discussed in this paper.First, the mathematic model of air-floating raft isolation equipment is established and its nonlinear dynamic responses are mainly discussed.Based on the theory of long-beating, then the dynamic responses and isolation performance can be obtained such as the steady state response and its spectrum, orbit, its Poincaré map and bifurcation diagram by the numerical technique.