The invention relates to a plane node processing method. The method comprises the steps of searching plane nodes of a space truss structure rod unit finite element model; determining instable directions of the plane nodes; determining a master node to which the plane nodes are attached; and binding the instable directions of the plane nodes with the direction degree of freedom of the master node. The technical scheme of the method is applied to a structure with many plane nodes, there is no obvious displacement sudden change, and the problem of plane nodes of a space truss structure can be processed well.