The Spring and Autumn Annals and Zuo Zhuan were not the same book. They were an ancient Chinese historical document and Zuo Zhuan's history book. The Spring and Autumn Annals was a classic work in the history books of the State of Lu during the Spring and Autumn Period. It was originally written by Duke Ai of Lu during the Warring States Period. After many changes and supplements, it became a classic work in the history books of China. It systematically summarized the political, military, and cultural events and figures of various countries in the Spring and Autumn Period with the history of the State of Lu as a clue, which had a profound impact on Chinese history. Zuo Zhuan was the short form of Zuo Zhuan's history book in ancient China. Its full name was Zuo Zhuan of the Spring and Autumn Period. It was a history book that recorded the political events and military struggles of the various vassal states during the Spring and Autumn Period. The book recorded in detail the political, military, and diplomatic events of the various vassal states during the Spring and Autumn Period. It was an important part of ancient Chinese history books. Although the Spring and Autumn Annals and Zuo Zhuan were both important documents that recorded the history of the Spring and Autumn Period, their content and writing style were very different, and each had its own unique value and function.