三世書又名 「三世相法」是指過去、現在及未來，亦即所謂前世、今世、來世。三世書相法是一本古書，不知何年代，為何人所著作。
三世相法的推演，與其他算命術大同小異，所不同的是其目的只是給人一種警惕。
三世書是在中國唐朝已十分盛行的算命奇書。內容豐富奇特，根據每個人出生的時辰八字，翻查推演出其人的前世、今生、後世，趣味盎然。

III of the book also known as "III phase method" refers to the past present and future the so-called past life this life the afterlife. III the book-phase method is an ancient books I do not know what age and why the people of the book.
III phase method of deduction and other divination much the same the difference is that its purpose is merely giving a vigilance.
III fortune-telling book has been very popular in the Tang Dynasty in China Masterpieces. Content rich and strange according to everyone born in the hour of horoscopes checked deduce its Past Present and future generations interesting.