Gu Long, as one of the most important Knight-errant novel writers, succeeded in creating a new fashion in Knight-errant novels. His works on Knight-errant novel were widely read and discussed in his time and also captured the minds of those who read any of them in consequence that Gu Long made up the stories in an easier and more popular style. This research is intended to focus on the innovation and characteristic of Gu Long’s knight-errant novel. Through the study of Gu Long’s life and works, we will probe into the factors how Gu Long’s achievements in the writing art innovated on knight-errant novel and its style.