Based on the problem that the service entity only has the partial field of vision in the network environment, a trust evolvement method of the macro self-organization for Web service combination was proposed. In the method, the control rule of the trust degree in the Dempster-Shafer(D-S) rule was utilized based on the entity network interactive behavior, and a proportion trust control rule was put up. The control rule could make the Web service self-adaptively study so as to gradually form a proper trust connection with its cooperative entities and to improve the security performance of the whole system. The experimental results show that the historical successful experience is saved during the service combination alliance, and the method can greatly improve the reliability and success rate of Web service combination.