Research conclusions:The warped reinforced earth － retaining wall is better than the ordinary earth － retaining wall in seismic property because the wrapped effect can make seismic wave weak during the propagation and amplification of the seismic wave along the wall up．When in 0.4 g and 0.616 g ，the model produced the evident seismic fall，and cracks happened in the junctions between the wall panel and the reinforced soil and between the reinforced soil and the unreinforced soil．In the peak acceleration，the potential fracture surface of these two kinds of experimental models were distributed in the same position，approximate to 0.45 H vertical line． But in the " Code for Design of Retaining Structure of Railway Subgrade" (TB 10025—2006) ，the potential fracture surface is approximate to 0.3 H vertical line and it slants to unsafety．So the reinforcing length should be increased in design． From the theoretical calculation and the analysis results of the internal and external stability of the reinforced earth － retaining wall obtained by the test data calculation，it was seen the coefficient of sliding resistance，the coefficient of capsizing resistance，the coefficient of uplifting resistance of the whole wall and the coefficient of uplifting resistance of the geogrid in various layers obtained by theoretical calculation were larger than the test data calculation． This showed the current code was unsafe and could be properly modified．