In order to meet the integration/verification requirement of high integrated and more complex avionics system, this paper proposes modelbased integration and verification technology of avionics system. The modelbased system simulation and test solution, simulation model specification, and modelbased working system integration and verification platform are described in detail. Through the application in the integration of avionics system, the integration efficiency is enhanced and the accuracy is assured by using the modelbased system integration method. This method can be used in the fulldigital integration phase, hardwareinloop integration phase and full system dynamic integration phase, it will improve the joined technical work among the three phases, and keep on enhancing the technology level of the avionics integration.