Yuan Hai Zi Ping (simplified Chinese: 渊海子平; traditional Chinese: 淵海子平; pinyin: Yuān Hǎi Zǐ Píng) is the first comprehensive and systematic book on the theory of Four Pillars of Destiny. The book was compiled by Xu Dasheng (徐大升) of the Song Dynasty of China and was a recording of various Zi Ping's fortune-telling methods. The method involves manipulation of the Four Pillars (Ba Zi)or eight Chinese characters which form the date and time of birth according to the traditional Chinese calendar.
The names of the book's chapters are: