"Book of Heaven" is adapted from the chapters of "Ping Yao Zhuan", an animated feature film produced by Shanghai Fine Arts Film Studio in 1983. Directed by Wang Shuchen and Qian Yunda, scripted by Bao Lei and Wang Shuchen, Ke Ming is the styling designer.

The film tells the story of Yuan Gong stealing the celestial script in the Tiangong, carved in a stone cave, and later stolen by three foxes. After the fox practiced Tian calligraphy, it harmed the people. In the end, the swan egg was transformed into a human-shaped egg. After learning the method, he and Yuan Gong eliminated the fox demon, and Yuan Gong was caught back to the heaven for leaking the secret.