Abstract: The material classification in some chinese penetrant testing standards such as JB/T 7523—2004, JB/T 4730.4—2005, GB/T 18851.2—2005 and HB 7681—2000 was introduced, and the verifying methods for sensitivity grade in those standards were presented also. The comparison made the difference in those standards more clearer, and it was helpful for the standard choice for penetrant testing person, and could promote the use of penetrant testing in our country.