Test data is the final product of the civil aircraft flight test, which is an important basis for reflecting the aircraft system status and showing the airworthiness compliance. With the application of a large number of advanced aviation buses on civil aircraft, the volume and types of test data become larger and more complex, which has brought huge challenges to the processing and analysis of test data. This paper studies the types, storage characteristics and common analysis methods of civil aircraft flight test data. The processing and analysis requirements of flight test data were analyzed in depth. Based on the WPF ( windows presentation foundation) platform, MVVM (Model-View-ViewModel) design pattern was adopted, key technologies such as memory management and DataBinding were used, and components such as SciChart and timing database were integrated. The data processing and analysis software for civil aircraft flight test were designed and developed. The software not only realizes the rapid processing, analysis and visualization of flight test test data, but also can complete the simultaneous loading of multiple data files and perform centralized display of data analysis results with different sampling rates from 1 Hz ~ 16 kHz. The actual application meets the flight test requirements of a domestic large passenger aircraft.