Aiming at liquefied natural gas (LNG) spilling on water and evaporating natural gas dispersion, the FLUENT is used to simulate the Coyote series 3 and 5 based on the Monin-Obukhov theory. Comparison results show that FLUENT simulation results are closer to experimental values than SLAB and DEGADIS results. While the process of NG dispersing on water is simulated by setting higher wall heat conduction rate, and LNG spilling on ground is simulated by using lower LNG evaporation rate. Results show that LNG spilling and dispersion on water can get higher volume concentration than which occurs on ground.