Distributed Spatial Analysis Service (DSAS) is studied and implemented in this paper. A logical architecture of building DSAS based on XML and Web Services is proposed. The architecture is firstly described. After that, how to describe the metadata of DSAS with XML is briefly depicted. Web services interface of DSAS is then focused. In this part, five problems related with DSAS interface are studied, including the definition of DSAS interface, the access mode of DSAS interface, the presentation of geospatial feature, the request/response message (RRM) schemas for accessing DSAS, and the interaction way between service consumer and DSAS. The result of every studied problem is discussed in detail. Then, a physical architecture of implementing the proposed architecture is presented based on Java Web Services and Java 2 Enterprise Edition (J2EE). A DSAS instance is built according to the physical architecture. Finally, the performance of the created DSAS instance is analyzed. Finally, some conclusion is made.