The focus of the thesis is the rational disposition of handling machinery numbers and capabilities 研究的重点是如何适应生产发展的需要，对装卸机械进行“量能”配置。
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The sixth part tries to find a way to improve the efficiency of dock loading and unloading system . the seventh part gives a method about how to possess optimum machinery number by employing probability tool 第七章利用概率统计方法，确定各类型机械的合理拥有量，给港口设备部门的机型选购、机械出让决策，提供辅助参考。
