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It is of practical significance and great value to find a component model for integrating software. Through the induction from a class of oil-drilling engineering applications, we proposed a modeling technique for domain-specific software based on business component component. In this paper, a goal-tree based domain-specific model for oil-drilling engineering is suggested. It offers the benefits of extensibility, modularity and reusability. Furthermore, a business component model for mapping domain-specific model into real system is proposed. The specialties of business component model contribute to the integration of heterogeneous modules.