Abstract: The basic data sources of SAIC is complex， mainly concluding the data from the state bureau of AIC and the local governmental bureau of AIC.There are differences construct and development among the local bureaus, such as the database, data structure, data standard etc. so, when constructing the data center, SAIC must choose suitable technical methods according to the actual circumstance of local AIC bureaus first, then upload the local data to the data center of SAIC after extracting, transferring and integrating them. So, this paper introduces the actual technical methods of data extraction.

Key words: data extraction, data center, data share