Zhang Heng is a man seven chi tall, with triangular eyes, yellow whiskers, red hair and crimson eyes. He is an excellent swimmer and can leap out of the water from wave to wave like flying fish. He is nicknamed "Boatman" for his abilities. Zhang Heng is one of the leaders of the Liangshan navy. During the campaign against the rebel leader Fang La, his brother Zhang Shun is killed by the enemy general Fang Tianding. He kills Fang Tianding in revenge, then he faints and dies from illness not long later.