The disclosure discloses a system and method for Message Passing Interface (MPI) implementation in an embedded operating system, applicable to a communication system including an application layer, an MPI layer, and an operating system layer, where an MPI application at the application layer is an application allocated to one or more MPI nodes; the Mil layer includes a process handling module, an underlying function library, and an MPI Application Programming Interface (API) to be invoked by the MPI application; and the process handling module receives a command of a user to invoke the MPI application, starts the application in response to the command, and invokes a service function of the embedded real-time operating system at the operating system layer through the underlying function library to control the one or more MPI node to execute and finish sub-tasks corresponding to the MPI application on the respective nodes.