Abstract: The navigational safety of LNG（Liquefied Natural Gas） tank container carriers in inland waters is an important issue of concern to the industry. The LNG tank at anchoring state is taken as the research object, and the CFD（Computational Fluid Dynamics） simulation method is used to build the physical model of the LNG tank leakage. Based on the data of inland 702 TEU container ship, T75 tank and LNG tank store-loading requirements, the computational domain model is established by Space Claim and the extreme adverse conditions of continuous LNG leakage are introduced to carry out the simulation test of LNG leakage and dispersion limit distance. The test results show that the safe distance of the limit dispersion is about 187 m. Based on the comprehensive consideration of LNG ultimate dispersion distance, anchoring accident risk and anchoring safety state, the calculation model of the anchoring safety zone of inland river LNG tank carrier is built. The suggestion of anchoring safety zone with a radius of 315 m is proposed, and the anchoring safety suggestions are put forward. The research results can provide technical support for the water transportation department to formulate relevant standards and safety supervision system.