the stability of the acousto-optical bistable system is analyzed in theory and the stability of the fixed points is researched by diagrammatized mode.By the method of numerical calculation
the concrete position of the bifurcation points is calculated and the reason for chaos generation is studied.Bifurcation diagram of the system state evolving with parameter and the largest Lyapunov exponent changing with parameter of the system all show that the analysis in theory is right.