In view of complex geological characteristics and alternating loading conditions associated with cyclic large amount of gas injection and withdrawal in underground gas storage (UGS) of China, a series of key gas storage construction technologies were established, mainly including UGS site selection and evaluation, key index design, well drilling and completion, surface engineering and operational risk warning and assessment and so on. Theses technologies practical applications were discussed and summarized. Firstly, trap dynamic sealing capacity evaluation technology for UGS converted from faulted gas reservoir was worked out. A key index design method mainly based on the effective gas storage capacity design for water flooded heterogeneous gas reservoirs was proposed. To effectively guide the engineering construction of UGS, the well drilling, high quality cementing and high pressure and large flow surface injection and production engineering suitable for long-term alternate loading-unloading conditions and ultra-deep and ultra-high temperature formation were developed. The core surface equipment like high pressure gas injection compressor can be manufactured by our own. Last, the operational risk warning and assessment technology for UGS was set up. The above 5 key technologies have been utilized in site selection, development scheme design, engineering construction and annual operations of 6 UGS groups, including Hutibi, Xiangguosi, Shuang 6 UGS, et al. To date, the 6 UGS groups have over 7.5 billion cubic meters of working gas volume and all the storage facilities have been running efficiently and safely.