Abstract: By the study on the test of 1 /2 scale fundamental element of ecological composite wall，it was compared different factors of bearing capacity and failure mode of fundamentdal element． Then the reasonable failure modes of the fundamental element were proposed． A nonlinear finite element model was set up and relative stiffness and relative strength of the fundamental element were analyzed based on the reasonable failure modes on the basis of the test results and numerical analysis． The study on the test and the analysis show that the reasonable failure modes of fundamental element are the corner crush of block ( CC failure modes)． In order to make the CC failure modes occurred，the reasonable value of the relative stiffness of fundamental element is 2. 14 h 3. 47，and the reasonable value of the relative strength fundamental element is 4. 66nc8. 04．