According to the definition in 《Charterparty Laytime Definitions 1980》, analyses the criteria for judge safe port (berth) and its geographical scope, states the main factors in determing safe port (berth), including physical, political and economical factors.
围绕《１９８０年租船合同装卸时间定义》对安全港（泊）的定义，分析了判定港口是否安全的相关标准和安全港的地理范围；具体阐明了判断安全港（泊）的物理因素、政治因素及经济因素。
