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In order to adapt to the dynamically changing web service resources in the open environment and ensure the composite service meet the business requirements continuously, the paper presents a service-cluster based approach to service substitution. Substitution means replacing a component with another component, as long as the replacing component produces the same output and satisfies the same requirements as the replaced component. The paper proposes deploying web service cluster to perform service substitution, which will have less impact on the ongoing, and sometimes critical, business processes. Service cluster contains a logic service and a set of concrete services, these concrete services have functional equivalence or compatibility. The method can quickly replace service; better ensure the normal operation of the combination of services. At last, we make a conclusion and put forward the future work.