： This article describes the basic principles of eddy current test and analyzes the acceptance standards of eddy current test for boiler tubes at home and abroad.

In this article,authors discuss the acceptance standard of prestressed anchor bolt with large diameter and high strength.

Three structure types of arched corrugated metal roof are introduced and combined with practical work the construction technology of this structure is discussed as well as related acceptance standards.

The shortcomings of the current NDE standards are pointed out, and a new flaw acceptance criterion is presented, which is different from the current ones based on fracture mechanics.

This paper makes detailed technical analysis on the direct substitution of utilizing the gasmeter of the air substitution and the indirect substitution of utilizing the gasmeter of several inert gases substitution, and makes economic and technical comparison.