In the course of rock engineering for rock-bolt strengthening, there are many key factors that influence rock-bolt strengthen such as the material of rock-bolt, the structure of rock-bolt, the way for rock-bolt and rock nature and the parameter of rock-bolt and so on. The research of influencing factors can provide a very valuable reference for valid protection and concrete construction for the rock engineering round rock. The research shows that the change of stability of wall rock round rock-support is the direct reflection of the rock-bolt result.