During the store and transport process of LNG (liquefied natural gas), security issues are always in a very important position. The mainly hidden dangers of LNG come from its inflammability, diffusibility and the cryogenic properties attribute. This paper analysis the structure of the tank, safety valve and some other items during the LNG transport by means of the accident tree, and reveals the logic relevant of the incidents which cause the accident, finds out the potential dangerous factors in the system. The research result provides the evidences for drafting the safety measures of the LNG transport vehicles and adopting the management measures.
