Wang Zhen stipulated the specifications for movable wood type and invented the roulette type picking plate. When typesetting, people are represented by words, which reduces the labor of the typesetter and improves the efficiency of typesetting. He systematically recorded the method of making wooden movable type and the entire process of type selection, typesetting, and printing. He titled it "The Method of Making Movable Type and Printing Calligraphy" and published it as an appendix in his "Agricultural Book". This is the world's earliest documentation of movable type printed books. After the invention of wooden movable type printing, it was more convenient than the original movable type printing method, so it gradually became popular in various places.