Yu Baosi was big-sized and tall, resembling a giant, thus earning him the nickname 'God of the dangerous road' (险道神). He gathered a bandit army of about 200 men and robbed for a living in Qingzhou.
Duan Jing-zhu once bought about 200 fine horses from the north and arrived in Qingzhou, but Yu Baosi robbed the horses and presented them to the Zeng Family Village. Chao Gai led the Liangshan heroes to attack the Zeng Family Village and was killed by Shi Wengong.
