Liquefied Petroleum Gas (LPG) is a vital energy source as well as a chemical feedstock, known for its flammable and explosive property. The demand for LPG has increased in recent years, leading to the frequent occurrence of leaks and explosion accidents, which pose a serious threat to public safety. This paper investigates the process of the consequences evolution of leakage of LPG and explosion accidents, using the Wenling, Zhejiang, China, LPG tanker explosion accident as an example. The main explosive processes that occurred after the leak, i.e., Boiling Liquid Expanding Vapor Explosion (BLEVE) and Vapor Cloud Explosion (VCE), were reconstructed through the collection and organization of data from the incident. The EFFECTS software was used for the simulation of container rupture, vapor dispersion and explosion pressure. The simulation results were consistent with the actual on-site effects. Multi-energy TNO method was used to measure the impact of VCE on overpressure hazards. This resulted in a blast energy of 3.1 × 10⁵ MJ and a staff wound radius of 324 m. Based on the site's terrain and traffic route layout, measures were proposed to install protective walls around the turnaround area. Effective measures were taken to reduce the range and intensity of the explosion and thus to mitigate the consequences of the accident. This measure reduced the damage radius of the accident by 25.6%. This work will serve as a reference for investigation, analysis, scenario development and recommendations to prevent accidents.

液化石油气（LPG）是一种重要的能源和化学原料，以其易燃易爆的特性而闻名。近年来，液化石油气需求量不断增加，导致泄漏、爆炸事故频发，对公共安全构成严重威胁。以浙江温岭液化石油气罐车爆炸事故为例，探讨液化石油气泄漏及爆炸事故的后果演变过程。通过收集和整理事故数据，重建了泄漏后发生的主要爆炸过程，即沸腾液体膨胀蒸气爆炸（BLEVE）和蒸气云爆炸（VCE）。采用EFFECTS软件对容器破裂、蒸气扩散和爆炸压力进行模拟。仿真结果与现场实际效果一致。采用多能TNO方法测量VCE对超压危险的影响。这导致爆炸能量为 3.1 × 10 ⁵  MJ，人员受伤半径为 324 m。根据场地地形和交通路线布局，提出在周转区周围设置防护墙的措施。采取了有效措施，减小了爆炸范围和强度，减轻了事故后果。这一措施将事故损害半径缩小了25.6%。这项工作将为调查、分析、情景开发和预防事故的建议提供参考。