Abstract: In view of the current database query process, in handling mass data, using conventional inquires the method not only waste the database resource, repeating the useless operations may make database burden and collapse, make inquires very time-consuming.This paper proposed to simulate an XML document database structure, database inquiry into an XML query.Using on proposed a more convenient inquires the solution.Computer simulation results proved that the query model can be vastly improved data query speed, and get a good effect.