本文从犯罪现场为基础,并以环境犯罪学观点,自国外实证研究结果就个人层级(理性选择理论)、社会互动层级(犯罪型态理论)、社会层级(日常活动理论)三种不同层次探讨性侵害加害者的决策模式(decision-making model)、犯罪空间型态(spatial patterns)、作案手法(modus operandi)与犯罪现场迹证(crimescene evidence)彼此关联性。并针对个案刘菖菖进行生命叙说之访谈,透过犯罪现场迹证及生命故事脉络交叉验证和修正对于心理迹证之假设,期盼形成有助于侦查实务的实践知识(practical knowledge)。 Based on the crime scene and from the viewpoint of environmental criminology, the dissertation explores three different levels of individual level (rational choice theory), social interaction level (crime type theory) and social level (daily activity theory) from foreign empirical research results Decision-making model, spatial patterns, modus operandi and crimescene evidence. Interviewed on the case of Liu Chang-chen for life narration, cross-validating and amending the hypotheses on psychological evidence through the crime scene evidence and the story of life story are expected to form practical knowledge for investigation practice.