Abstract: The on-schedule safe commissioning is the important link to secure smooth and efficient operation of LNG terminals. Once the quality control of key links doesn't reach the standard, such as construction, purging, air tightness, drying replacement, pre-cooling and single machine commissioning of pipeline and equipment, accidents may happen frequently while LNG terminal is put into production and even the trial run is delayed. In this paper, the quality control essentials in each key link of commissioning of LNG terminal were summarized by taking the problems which appeared in a certain domestic LNG terminal during its commissioning as the research object. Then, the factors that influence the drying and cooling effect of LNG tanks and process pipelines and the key points that shall be checked before the single machine commissioning of important equipments were analyzed thoroughly. Finally, the construction control measures were proposed. The research results can provide the experience for the commissioning of other newly built LNG terminals and can also be used as the reference for relevant design and construction companies.