Damage of spray membrane waterproof material in the complicated groundwater environment was studied by using X ray computed tomography （CT） and the validity of deciding the failure of the material was explored. With NaCl, Na2SO4, NaOH solution and the mixture of any two solutions, the spray membrane waterproof material was scanned by CT after immersion corrosion test of the material and the failure of the material was evaluated by using the change of CT number and CT variance. The results show that when the waterproof material is immersed in three kinds of single solutions respectively, the damage of the material in NaOH solution is the most serious and that in NaCl solution is slightest. After any two of the three solutions are mixed, the effect on the damage of the material is changed, but the damage is not all increased compared with the single solution; in the mixture of any two solutions, if the type of solution is changed, the sensitivity to concentration of another solution on the damage of the material will vary. CT number and CT variance can be regarded as efficient indices for evaluating the damage of the spray membrane waterproof material.