隨著科技的發展，流通使用的化學物質種類愈多樣化，國內對於化學品的安全管理、環保方面以及毒化災事故的處理也趨於重視。產業的發展不可避免的會使用各式化學物質，其中特別的是毒性化學物質，若因操作不當或意外事故造成外洩將可能擴散至大氣而造成重大之環境與人員的傷害。 大園鄉內工廠林立，尤以大園工業區為主要分布地區，包含許多化學工廠及高科技廠房，皆存放眾多危害性化學物質，一旦發生災害將造成嚴重影響，故本研究以桃園縣大園鄉大園工業區做為研究範圍，運用ALOHA擴散軟體進行分析，模擬毒化物擴散的情形與可能影響的範圍，產出結果以GIS 展示，並套疊大園鄉內基本圖層(如人口密度，醫院、學校、救災資源等)，規劃出毒性化學物質災害發生時，如何進行避難疏散，冀望藉由此研究能供為鄉（鎮）市公所在製定地區災害防救計畫之參考。 With the development in technology, the circulation of chemical substances are getting various. Society has a tendency to put emphasis on chemicals safety management, environmental protection, and handle of toxic chemical accidents. It is unavoidable to use a great diversity of chemical substances in industrial developing process, especially toxic chemicals, the leakage resulted from improper operation or accidents may diffuse to the atmosphere and cause significant damage to environment and people. A large number of plants including various chemical and high-tech plants established in DaYuan Township especially in DaYuan Industrial District, all plants store quantities of hazardous chemical substances, which may cause serious damage if any incident occurs. This study aims to research in Dayuan Industrial District, use ALOHA diffusion software to analyze and to simulate the diffusion of toxic chemical substance and possible affected field. The result would be represented by GIS, and then apply to basic layer of Dayuan Township (such as population density, hospitals, schools, disaster relief resources, etc.). Planning how to proceed evacuation when a toxic chemical substance disaster occurs. Hopefully this research could be provided as reference in the development of regional disaster prevention plan
