As technique of integrated modular avionics developing, requirement of large data transfer requirement is increasingly clear. Methods currently used either need to modify existing architecture or need specific functional support from operating system, which limits their application in different avionics systems. In order to solve this problem, a multiple window protocol as well as its implementation is proposed in this thesis. This protocol applies extra resource to keep transferring multiple windows and remains high stability and efficiently while working in unstable airborne networks. Therefore, it can meet the requirement of efficiency and stability of large data transferring in avionics system. And also, this protocol can be implemented at application level; there is no need to modify existing system architecture. This character makes it have a wild range of application.