Abstract: The Validation of ISO standard method for the examination of fluoride in drinking water was introduced.The test for compensating interfertence,standard curves,accuracy,precision and the minimum detection limit,etc.were included.The comparison between ISO method and others was made.The results indicated that the ISO method was better in anti-interference,wider linear range and higher precision.The points designed were reasonable.The method is superior to other methods in the same kind,and it should be adopted and extended.