Abstract: The data of distributed data system is identical logically,and dispersed physically.And this system may access data from various sources,which are stored in the same or different computer.Compared with the centralized system,it has its advantages,but there also exist some new problems,such as data consistency,distant transmission,and telecommunication spending and so on.The article analyzes on the distribution and acquirement of distant object,data query,distributed data query,and touches on the advancement...