Abstract: The safety problem of liquefied petroleum gas (LPG) is significantly important since it is a frequently used chemical substance prone to ignition and explosion. The explosion case of LPG tanker in Linyi, Shandong, was investigated by the UDM model in PHAST software under the method of parameter controlling. The results show that the direction of leaking affects the explosion scenario remarkably. When it is upward or downward, the leaking and jet radiations have a minimum or maximum effect area, respectively, while horizontal, a liquid pool would be formed. With the increase of ambient temperature, the leaking and expansion distances and the influence area of flash fires increase while the jet flame radiation decreases, especially within the distance of 150~200 m. The surface-roughness affects little to the jet radiation intensity while the explosion shock wave shows a revered relation with it.