Gas injection is often used to maintain formation energy due to the problem of leakage in fractured conglomerate reservoirs and ultra-low porosity and matrix permeability in tight reservoirs. However，due to the existence of fractures，gas channeling is serious，so it is necessary to take anti-gas channeling measures to restrain gas channeling. By combing the research at home and abroad，the characteristics of foam drive gas were analyzed from the perspective of gas-liquid differentiation and viscous fingering. The foam mainly channeled by reducing the relative permeability of gas phase，profile control，gas floating oil displacement，oil selectivity，fluidity control and emulsification. Based on the comprehensive analysis of the characteristics of gas detection and the mechanism of foam sealing and channeling，the deep sealing and channeling technologies at home and abroad， including foam anti-gas channeling technology and foam sealing and channeling system，were discussed in detail. The influence factors of anti-gas channeling measures were analyzed from six aspects：permeability range，foaming agent concentration，injection method，injection speed，oil saturation and system composition. The construction effect of foam plugging in low permeability tight reservoir was introduced. Finally，the future development direction of this kind of reservoir sealing channeling technology was proposed. Foam system played an important role in deep reservoir sealing field，especially in low permeability and tight reservoir. Its performance evaluation index and plugging effect had been significantly improved. It also had a good adaptability in high permeability，fracture and heterogeneous reservoirs.