Abstract: In order to solve the problem that the existing hydraulic support with four-link stable mechanism can not adjust its attitude autonomously under the support state, a new type of hydraulic support based on five-link stable mechanism is proposed. The five-link stable mechanism has two degrees of freedom, and the stable mechanism can operate freely under the working state of the hydraulic support, which effectively solves the problem that the four-link hydraulic support can not adjust its attitude autonomously under the normal support state. According to the specific structural characteristics of the five-link hydraulic support, this paper establishes the plane bar system model of the support, and deduces the relationship of the main mechanical parameters such as the support resistance of the hydraulic support, the force of the attitude adjusting jack, the upper front link force, the lower front link force and the rear link force. Based on the above relationship, combining with Creo software, the motion simulation is carried out. According to the simulation results, the effect and influence of hydraulic support link parameters on the link force, the force of the attitude adjusting jack and the support strength are analyzed, the specific optimization results are given, and the optimization direction of this type of support parameters is pointed out. The research results are of reference significance to the structural design of this type of support.