引言:新中国成立后不久,我就在吴承明教授领导下工作。六十余年的言传身教,使我获益终生。1978年,我开始研究清代经济史,有时提出一些问题和意见向吴老请教,有些文章也呈请吴老指正。他每次总是回复我一封信,对我提出的问题和观点以及文章中论述不足之处,一一作答,并从理论上引申,以求题无剩义。从1982年至2004年,这类信函共达23件,约三万余字。这充分体现了他诲人 Introduction: Soon after the founding of New China, I was working under the leadership of Professor Wu Cheng-ming. Sixty years of precept and example, so I benefit from life. In 1978, I began to study the economic history of the Qing Dynasty, and sometimes asked some questions and opinions to ask for advice. Some articles also asked Wu to correct me. He always replies to a letter from me, answering the questions and opinions raised by me and the shortcomings discussed in the article one by one, and extends it theoretically to find a solution to the problem. From 1982 to 2004, there were 23 such letters totaling some 30,000 words. This fully demonstrates his teachings