本研究探討縱火受刑人各類縱火動機的普及率及再犯危險性。以問卷調查方法，調查包括全台灣各監獄內的縱火罪受刑人，及部分非縱火罪受刑人，共計六百三十位。研究結果顯示受刑人的縱火動機具有多樣性且不特別集中於少數縱火動機的情形。而各類縱火受刑人中，以具有湮滅證据、追求刺激、無特別理由、回應幻覺、謀取利益、想要破壞、得到注意等動機者，具有較高的再犯危險性。最後，本研究就縱火受刑人各類縱火動機的普及率、受刑人縱火動機種類、多元性與再犯危險性、縱火動機的結構及縱火犯的分類、以及縱火罪的性質，進行討論。

The study investigates the prevalence and recidivism risk by motives of arson inmates. Survey technique is adopted. Subjects include almost all the male and female arson inmates and randomly selected non-arson inmates in Taiwan's prison, totally 630. The results show the diversity of arson motives and the characteristics of not specially distributed on some motives. Arsonists with crime concealment, sensation seeking, no special reason, hallucination responding, profit gaining, attention seeking, and vandalism motives have higher recidivism risk. The more kinds of motive the arsonists present, the higher the recidivism risk. The prevalence and recidivism risk by motives of arson inmates, structure of arson motives and types of arsonists, nature of arson behavior are discussed.