This paper addresses the determination of the sizes and the numbers of storage bins in a warehouse system with variable storage bin size for the discrete and finite time period. The sizes of products that are stored in the warehouse are diverse and different according to the product. The maximum inventory amount of the product in a warehouse is changed dynamically for given time periods. The warehouse needs several sizes of storage bins to store products that are different in size. In each period, the sizes and the numbers of storage bins can be changed according to the size and the inventory amount of the products. The sizes and the numbers of storage bins which minimize cost are determined in each period during given time period. The cost factors are fixed cost when the sizes or the numbers of storage bin are changed and use cost for cubic size of total storage bins. The problem is analyzed and a mathematical model is formulated. And a dynamic programming algorithm is developed. A numerical example is shown to explain the algorithm.