This paper presents a composite reinforcement mechanism for reinforced structures. The principal of quasi - cohesion and friction - bar theory are both introduced. In order to evaluate the validity of the proposed theory, the previous experimental results are adopted to compare. It is found that the result obtained by the composite reinforcement mechanism is slightly higher than that of simplex reinforced theory,  and it is more close to the experimental values. It is proved that the proposed method is more efficient and reliable. A kinematic approach based on the framework of limit analysis is applied for seismic stability analysis. A rotational failure mechanism is used and the failure surface is assumed to be a logarithmic spiral surface. The seismic influence is substituted with a quasi  static horizontal force. By using the model, the strength of reinforcement is calculated and it can be simplified into the results obtained by the quasi  cohesion principal or friction  bar theory. A typical case is introduced and the influence of different mechanisms is also discussed. The result shows that the critical reinforced force obtained by the composite reinforced mechanism compared with that given by the other two kinds of mechanisms is distinctly decreased.