Abstract: To make comparative study on spatial mechanical properties of RC shear wall with single row of steel bars and that with double rows of steel bars,an experiment has been introduced in the article,in which low cyclic reversed unidirectional load has been applied to a model of 1/2 scale.In the model,bi-directional steel bars of double rows have been designed to one side while those of single row to another.What's more,a vertical load has been exerted in the center of the slab evenly with a set of force-transmitting structure.Based on the experiment,the load-carrying capacity,hysteretic behavior,stiffness,out-plane performance of the shear wall and failure phenomena have been discussed.Besides,vertical load-carrying capacity has been calculated with yield-line theory.It's shown that hysteretic behavior and out-plane deflection of both sides are much similar while the slab under a vertical load.And that still goes well when the slab seriously damaged under extreme load,as the result of the collaboration of the web and flange.That is to say that the binding force on the slab of both sides is almost the same,so does to the out-plane performance of the shear wall.Therefore,rational designed RC shear wall with single row of steel bars can satisfy seismic demand.