The rapid development of volunteered geographic information generally becomes research focus in the field of geoscience. This paper analyzes the core questions of the evaluation of data quality, the fusion of geometric data and the conversion and matching of attribute information. during the volunteered geographic information used in mapping update, then proposes a general process of volunteered geographic information analysis and fusion operation, and finally puts forward the corresponding solutions for each question. Finally, the process and the strategy was verified by using Beijing OSM data.