The dynamical behavior of controlled Gibbs laser system is researched. Gibbs laser system model is introduced at first. The images from Lyapunov exponent of Gibbs laser system changing with incident light intensity parameters and the relationship curve of the relative system state variable and incident light intensity parameters are given. The influence on system dynamical behavior from feedback signal intensity is simulated further. The results show that nonlinear effects such as double periodic bifurcation, periodic combination and chaos through regulating feedback signal strength exist in the system.