Based on the application requirements of small airplane avionic systemwe designed a logical framework of the systemand put forward the top-level Functional Flow Block Diagram (FFBD) of flight display and integrated processed computer by analyzing the framework of small integrated cockpit avionic system.Three critical technologies were proposedincluding real-time multi-channel data acquisitionredundancy path realization and data loading.Then the specific realization method was given.This system was implemented on VxWorks embedded real-time operating systemand has been applied in an integrated avionics project for a certain type of aircraft.