This book is one of the representative works of Chinese famous historian Yang Kuan. It edited the historical materials on a yearly basis, which was on to the last year of “Zuo Zhuan”, until Qin Dynasty unified the whole country, starting from king Zhending of Zhou (468 BC) and ending in the twenty-sixth year of king Ying Zheng (221 BC). The historical materials of the original distraction, the chronological error, and the true or false confusions, are arranged and compiled for the year, so as to be an orderly and authentic historical document. These historical data focus on the major events of the year, including the rulings of Political Strategists, the rhetoric and the letters. Widely used in all kinds of ancient books and modern-person research results, the material is rich, sophisticated, and has a very high academic value.