OBJECTIVE:To provide accurate business data for purchase and payment of drugs in order to reduce inventory costs and improve cash circulation efficiency. METHODS:According to analysis of influence factor for required payment and actual payment,business data of drug purchase and payment were put forward and designed in respect of business process,data structure,algorithm and so on. RESULTS:Scientific payment management applied in information system resolved the problems of inaccurate basic data of drug payment and information islands. CONCLUSIONS:Funds of drug purchase achieve scientific distribution by hospital purchase and payment to minimize the cost of drug stock and improve the utilization rate of funds.