Due to risk of production string integrity failure and the significance of integrity detection, the mechanism and characteristics of available detection technologies are systematically summarized.The typical technical equipment and methods are introduced on the basis of classification and analysis.Combined with case well, the technical requirements are analyzed for the integrity detection of production string in deep gas wells,and the technical ideas and research suggestions are proposed.The analysis indicates that the downhole physical field characteristics are major basis for production string integrity detection, including sound wave, pressure, temperature, flow field and electromagnetic fields, etc.Related detection methods vary in terms of operation and detection capacity, such as detection for small leakage, leakage below liquid level and multiple leakage.Deep gas well has harsh downhole temperature and pressure environment and gas and liquid both exist in the tubing-casing annulus.The number of leakage point and gas migration pathway are various, with multiple annular high pressure.Ground qualitative diagnosis with downhole quantitative evaluation should be adopted to conduct integrity evaluation.For the well of great significance, distributed optical fiber should be deployed for real-time monitoring.Meanwhile, the temperature & pressure resistant properties of equipment should be improved.The work efficiency and accuracy should also be promoted.On the above basis, risk warning and control should also be conducted to build an integrated technical system featuring ground diagnosis, downhole detection and risk warning & control.This research can provide technical support and guarantee for the long-term safe production of deep gas wells.