Abstract: As the pipeline integrity management system has been developed and applied to some extent, the integrity management of steel tank, especially large-scale LNG storage tank, is still in its initial stage in concept and related methods. From deconstruction of integrity management to pipeline, it analyzes the nature of integrity management of pipeline through exploring its concept origin, practical purpose, and core technical system and management system. Starting from basic features of LNG storage tank, and according to related national codes, it tries to establish the concept of integrity management about LNG tank, puts forward framework for main systems. Combined with risk assessment methods and the latest research results for life cycle and aging of LNG storage tank abroad, it presents the assessment method for integrity of LNG storage tank, and thus provides good reference to the introduction of integrity management systems into LNG industry which is in flourishing development in China.