In 1962, Professor Ping-ti Ho published his book on Chinese civil service examination and social mobility, The Ladder of Success in Imperial China: Aspects of Social Mobility, 1368-1911. This is a first-class contribution to the subject of social mobility in traditional China. It has almost exhausted the existing data which may be treated statistically and which bears on the subject through the family background of members of the elite class in that society. As his primary source, he uses lists of holders of economic degrees which, according to Chinese law, include each candidate's ancestry for three generations. He also makes use of other sources, such as government statutes, certain local history, biographies, genealogies, and some works of contemporary observers. This book is a classic for all of the students of Chinese Studies and social sciences in past 46 years. It has been translated into Italian and Japanese since its publication. Yet, the most wanted Chinese version of this book has not published. Therefore, with Professor Ho's blessing, I propose a project to translate The Ladder of Success in Imperial China: Aspects of Social Mobility, 1368-1911 into Chinese with annotated notes. This essay is a Preface to the Chinese translation of Professor Ho's great contribution concerning the study of civil service examination and social mobility.