Annual examination policy of mechanical engineer certificate: the qualification certificates of building librarians, safety officers, builders, supervisors, material engineers, quality engineers, machinists, testers and surveyors must be re-examined every three years, and the expired certificates are invalid.

Annual examination object of builder's certificate: personnel who obtained the post certificate of builder before 20 10.

Location of annual review of librarians: attending continuing education at school and going to the construction department for annual review after graduation.

Annual examination materials: the original post certificate of the builder, a copy of the ID card and four one-inch color photos.