Abstract: The semantic features of component are the foundation for component retrievals, and are the emphases of research for component repository. However, since there are a large amount of dynamic distributed service components in the network system, many components may have some kind of relationship or dependence with each other. As a result, how to efficiently describe the relationship between the features of different service components is a vital problem for the components management model, which needs to be further investigated. In this paper, a feature-based semantic description model for component is proposed. First, the presentation models of the feature, the feature space and the component feature space are defined respectively. Then, the association and dependency relations among the features of the components are classified into four groups: self constraint, paternity constraint, dominant constraint and recessive constraint. These four kinds of constraint are formally described by the object constraint language, which provides an accurate semantic support for such model. In order to describe the approach's application a component sub-tree based on features for e-business is studied as a case. The results of the model checking and experiments in the object constraint language environment prove that this model is correct and valid.