The liquefied petroleum gas (LPG) has multifarious risks associated with fire or explosion in the traffic and storage process. The leak of LPG can induce disasters including flash fire, unconfined vapor cloud explosion (UVCE), boiling liquid expanding vapor explosion (BLEVE), etc. In this paper, occuring condition and risk of those disasters are analyzed. Quantified risk analysis (QRA) is used in consequence assessment. The assessment method for the hazards to the environment by UVCE and BLEVE is researched.