In the current flight test mode, based on the lack of CAS information of a passenger aircraft and the single reconstruction platform, a set of CAS information real－time monitoring system was designed.Based on the WPF framework, the system uses telemetry PCM data as input, and uses a typical three－layer architecture, combined with DataBinding model and XAML technology to realize real－time parsing, transmission, distribution and display of CAS information. At the same time, the system greatly reduces the coupling between systems, improving real－time performance and system maintainability. Through the full verification of the tests such as taxiing and first flight, the system realized 100% ground recurrence of CAS information of this type of passenger aircraft, which could provide a reference for the subsequent innovation of flight test and monitoring technology of civil aircraft.