《明史·志·卷六十二》
成化二十三年，侍郎丘浚呈上《大学衍义补》，请求寻找海运故道，与河运同时进行，大致是说： 海船一艘装运千石，大略相当于河船三只的装运量，使用的运粮兵大量减少。
成化二十三年，侍郎丘浚进大学衍义补，请寻海运故道与河漕并行，大略言： 海舟一载千石，可当河舟三，用卒大减。
In the 23rd year of the Chenghua period, Minister Qiu Jun submitted The Supplement to the Expanded Meaning of the Great Learning, calling for the exploration of the old maritime transportation routes, to be used in conjunction with river transportation. He roughly claimed that: one sea ship could carry 1,000 shi, which was roughly equivalent to the carrying capacity of three river ships, greatly reducing the number of soldiers used to transport grain.