At the Engineering phase of Application System Project of FY-2(02) Geos tationary Meteorological Satellite, according to the general requirement of Data Processing Center, the application of software reengineering in the Data Proces sing Center of FY-2 series was described. Through a series of engineering proce ss, such as reverse engineering, restructuring of code, data and document etc，the software of data and product processing in advance study phase of FY-2(02) was rebuilt for productoriented and processingoriented flow, the common service w as obtained, the processing flow was simplified, furthermore, the elaborate docume nt was archived. After reengineering the application software of DPC data and p roduct processing system met with the multirequirements of ground application system of FY-2(02), such as highreliability, maintainability and real time, e tc.