In the Mobile Decision Support System(MDSS), the key problems of the decision-making technology based on multiple analytical sources are how to articulateand represent the user's global decision-making requests, and then decompose and map them to local analyzing requests on each DSS analytical source, as well as how to integrate the heterogeneous analyzing results. This article develops an object-subject model (OSM) which is based on decision-making subjects. By means of subjects and their operations, the OSM model unifies the decision-making capabilities supplied by varied DSS analytical sources so as to facilitate the formulation of the user's global requests and the inte-gration of heterogeneous analyzing results. Then the article describes the OSM-based algorithms of the formulation and decomposition of the user's global decision-making requests, the dispatching of analysis agents and the integration of the analyzing results.