The behaviors of linkage of built-in insulation reinforced concrete composite wall subjected to wind load were experimental studied in this paper. Three specimens modeling practical RCCW were cast and tested under static and repeated loads. The relative displacement between inside structural reinforced concrete wall and external concrete cover, the strains of steel tube walls were measured. The results show that specimens damaged with cracks at interface between external concrete cover and thermal insulation layer when load was up to 11.3 times of design value, the maximum stress of steel tube walls reached 25.3 % design strength, the safety factor is 1.67 when concrete cracked at steel tube. Therefore, the linkages are reliable to bear wind load on external concrete cover.