Bohai Sea is a fragile ecological and economic area with frequent oil pollution. On the basis of the actual business demands of oil spill emergency companies in Bohai, this paper puts forward to building the oil spill emergency response platform with "decision-makers view", which created an extendable emergency platform with Smart Client framework suitable for multi department cooperation and growing applications. The platform contains four main modules: (I) forecast and decision; (II) decision supports; (III) auxiliary supports; (IV) framework management. At the same time, the platform realizes many kinds of auxiliary analytical functions such as monitoring analysis, sensitive area analysis, case analysis, resource allocation etc with WebService and GIS technologies. It automatically provides a comprehensive decision list to the decision-maker before emergency actions. The application of the platform will shorten much time of the emergency preparation compared with manual brain decision, and improve the efficiency of the oil spill emergency greatly.