1886年,北洋舰船“定远”等前往日本长崎油修。马幼垣先生认为丁汝昌等此行有“愚笨误国”之失。本文通过探讨舰船油修的基本知识和必要性、当年晚清船坞建设的状况、丁汝昌为舰船油修所做的努力以及此行的直接原因等,认为丁汝昌等的这一选择实属无奈而亦无大害之举。所谓丁汝昌“愚笨误国”等语,有些夸大其词。 In 1886, the North Sea ship “Dingyuan ” and so on to Japan Nagasaki oil repair. Mr. Ma Youyuan believes that Ding Ruchang and other travels have “stupid mistakes” and the loss. This article considers Ding Ruchang et al.’s choice as a real choice by discussing the basic knowledge and necessity of ship oil repair, the status quo of the construction of the dock in the late Qing dynasty, the efforts made by Ding Ruchang for the repair of ship oil, and the direct cause of this visit And no harm. The so-called Ding Ruchang “stupid mistake” and other language, some exaggerated.