In the Three Kingdoms period, Sima Yi made him surrender to the Shu camp, assuming that Sima Yi was unfair in employing people: Zheng went to Qin Lang, but Sima Yi made Qin a pioneer, so resentment came down. Before he finished, Qin Lang came to challenge. Zhuge Liang sent Zheng Wen to fight, and then he followed. Only a close, Zheng Wen namely cut Qin Lang under the horse. Zhuge Liang realized his deception. After returning to camp, he said that there were several Qin Lang and Zheng Wen in Sima Yi's camp who were speechless. Zhuge Liang was furious and wanted to cut it. Zheng Wen told. Zhuge Liang ordered Zheng Wen to write a book to lure Sima Yi to rob the village. Sima Yi took the book, verified that it was Zheng's handwriting, and went gladly. His son, Si Mazhao, was meticulous and advised his father not to go out. First, he asked Qin Lang to explore the actual situation and get the result. Wei Bing was defeated and Qin Lang died in battle.