The communication interface technology of Model Base Management System (MBMS) and Database Management System (DBMS) is one of the key technologies for successful implementation of Decision Support System (DSS). This paper firstly introduces the concept model of communication interface between MBMS and BMS in DDS. Then it makes an analysis of the principle of communication interface between MBMS and BMS in DDS. Based on the analysis, three ways of its implementation are proposed: Standard Format Method, Function Method and Embedding Method, which finally realize the ODBC-based application of communication between MBMS and DBMS in DSS. This paper is of great reference significance for solving communication problems among database, model base, data warehouse, knowledge base, expert base and method base, and for accessing heterogeneous data or even extreme data in such emerging Decision Support Systems as Distributed DSS, Group DSS and Intelligent DSS.