Aiming at the stock problems faced by brand traders such as out-of-stock and overstock, this thesis has analyzed what leads to the stock problems of fashionable products and puts forward a demand forecast model of three stages with the help of an operation model of fashionable products' supply chain. A stock control model and an inspiring formula that fits those brand traders' fashionable products are also established in the thesis in order to realize a minimum stock coordinating cost. The analysis of cases has proved that the model works well in reducing the stock control cost. In the end, a conclusion is drawn that when the proportion of the prophase sales volume to the total sales volume is 0.2, it's the best time to replenish and the stock coordinating cost will achieve the minimum.