Based on the construction feature and “block-frame-outer frame” failure characteristics of the multi-ribbed composite wall, the strengthen method for damaged multi-ribbed composite wall with aerated concrete blocks to recovery and enhance the seismic performance of the structure was proposed firstly. Through cyclic loading tests on strengthen composite wall, the failure process and steel bars strain were analysis, and the hysteretic curve character and seismic performance such as bearing capacity, stiffness, ductility and so on were researched mainly. Test results showed that the failure and cracks distribution characters of the strengthen composite wall was similar to the standard wall, and the main seismic performance index was close to or equated to the standard wall; it was effective that using aerated concrete blocks (or other blocks with a certain strength) to strength the damaged composite wall. The strengthen method was effective, convenient and cost cheap, and provided reference to strength the multi-ribbed composite wall structure in earthquake area.
