Recombination is widely observed in RNA viruses，but many key issues therein could not be explained till now. In the paper，the reasons for the change of recombination frequency were explained based on RNA recombination mechanism and the influencing factors，and relevant issues to be addressed in the future were stated. RNA recombination was a special way to exchange genetic information by RNA viruses，with different frequency in various RNA viruses. At present，it was generally believed by researchers that，the mechanism of recombination could include replication，non-replication and reassortment，and the viruses and cytokines that might affect the process were gradually recognized with the help of new methods and technologies. It was studied that the recombination and reassortment rate of RNA were extremely high in RNA viruses，which was related to the fidelity of dependent RNA polymerase（RdRp）. Therefore，the new virus or outbreak could be early warned and reported through further recognition of the mechanism and rules of virus recombination，so as to control the occurrence and prevalence of animal diseases in a predictable way.