For the cooling tower, the distortion and breakage will occur due to constructional deficiency, concrete cracking and spalling, freeze-thaw rarefaction, deflation cracking, acid etching of air and rainfall, and temperature stress by muggy insolation and shrinkage etc. The internal causes, harm and influence for the breakage are analyzed combining the project practice. The maintenance and reinforcement techniques are introduced including gunite reinforcement, trap strengthening, and bind reinforcement etc. Aiming at various flaws and breakages, new maintenance techniques are proposed, providing references for the maintenance and reinforcement of cooling tower.