Abstract: In order to construct collaborative manufacturing service chain, a method for modeling and compositing manufacturing services is presented based on service oriented architecture. The granularity of manufacturing service models is discussed. According to product structure, the granularity is classified into four types: product, component, part, and working procedure. Definitions for basic manufacturing service model, extended manufacturing service model, and extended manufacturing service chain are given based on the granularity manufacturing service models. The principles and process of manufacturing service composition are proposed. Finally, a collaborative manufacturing service platform based on service oriented architecture is discussed with an example illustration.