With the development of steel industry, Chinese iron ore dependence is increasing year by year. By the market and cost structure influence, the economic benefits of the dry bulk fleet changes greatly, which affects the development of China imported iron ore ship style directly. This thesis builds the imported Brazil iron ore economic model of the single carriage which accords well with the actualities, and draws the curve of evaluation index. It also determines the optimal ship style and carries out a sensitivity analysis, so as to provide a reference for the planning of the arrived ship style of the ore dock.