Considering the coupling effects of elastic wing, elastic blade, rigid nacelle and connection points between systems, the mathematical model of the coupling system including wing/nacelle/tilting rotor is established. Based on the eigenvalue method, the overall modal changes of the rotor installed on the wing and the effects of speed and offset on the dynamic characteristics of the system are studied. The results show that the wing joint motion mainly affects the backward and forward modes of rotor flapping. Different rotor rotation speeds cause varying degrees of modal frequencies of wings in different flight modes, especially the wing flapping mode. The nacelle tilt angle causes significant changes in wing waving frequency, and other modes are basically unaffected. The shaft length mainly affects the wing shimmy and torsional mode in vertical flight, and the offset basically does not affect the wing modes in the forward flight stage.