Based on many year practice of reactive gas observation and its sophisticated quality control and data processing methods, the comprehensive and rational functional design and orientation have been assigned to the data processing system, which is developed by using the Visual Studio development platform combined with MAP WinGIS and other display control by means of the modular functional design and development method. The system has realized easily the visualization of the 〖JP2〗observation data in space and time, the good capabilities of human computer interaction, certain data statistic and analysis, etc. The system is an efficient tool for managing and processing reactive gas observation data, and has become an important component of the operational reactive gas observation data quality control and processing system.