Abstract: This article introduces a kind of smart structure system which can in real time and in a large area self\|diagnose the damage or large strain position in the composite material. From theory and experiment,the strain distribution in the composite material plate is analysed in this article and the arrangement of the strain resistant wires as sensors in the structure is discussed. A four sensors arrangement method is put forward. This article also introduces an actually realised real\|time damage self\|diagnosis smart structure system.This structure can work well.