Abstract: A stress corrosion detection method based on array eddy current and fully focused phased array technology is proposed, which can be applied to open tank detection and on-line detection respectively. A vertical reactor made of S31603 is tested and applied. The results show that array eddy current technology has the advantages of high sensitivity, high signal-to-noise ratio, no grinding, and high capability of data storage and analysis, etc., and that the full focus phased array technology has high detection resolution, high accuracy for quantitative positioning of defects, and high detection rate for stress corrosion cracking. The combination of the two methods can improve the detection rate of stress corrosion defects, and has high engineering application value.