海上拖航与海上救助拖带是两种性质不同的海上服务 ,但在具体实务工作中 ,拖带双方对这两者的区别和联系的认识还存在很大的差异 ,以至自从海上拖航出现以来 ,因这一问题产生的争议及涉讼现象屡见不鲜。本文论述了两者的区别、前者向后者转化的条件及转化后的影响。 At sea towing and towing at sea are two types of marine services of different nature. However, there are still quite different understandings on the differences and connections between the two towing parties in their concrete practical work. Even since the advent of maritime towage, Disputes and lawsuits arising from this issue are not uncommon. This article discusses the differences between the two, the conditions for the conversion of the former into the latter, and the impact after the conversion.