本篇論文要探討的主題為何種總體或個體因素會影響投保人在壽險上的解約行為。由於壽險保單的解約行為會讓保險公司面臨現金流、聲譽、逆選擇等風險，進而影響公司營運。因此探討影響保單解約率之因素，進而準確估計保單的解約率為十分重要的議題。此外，不論投保人主動解約或是被動使保單失效均會對保險公司造成影響，因此本篇論文也將利用不同解約率的計算方式進行實證分析，研究是否不同計算方式的解約率會影響實證結果。本文使用NAIC (National Association of Insurance Commissioners)保險資料庫之年報資料，對2004-2014年間保險公司之經營狀況進行分析，驗證解約率實證中常用的三個假說：市場利率假說、緊急資金假說以及保單替換假說，選用之變數包含失業率、利率、保單替換率、高齡比等變數，並採用固定效果模型作為縱橫資料之迴歸模型，分別對不同計算方式所得之解約率進行迴歸分析，並比較彙整其結果。最後針對結果提出未來研究之建議。 / Insurance companies’ business will be influenced by surrender activities in several aspects, such as cash flow problem and inverse selection problem. Empirical researches show that both macroeconomic variables and microeconomic variables will influence surrender behaviors. Hence, this paper seeks to which kinds of macroeconomic variables will influence surrender activities and investigates whether using different ways to calculate surrender rate will cause different empirical results. All available US insurance company data, ranging from January 2004 to December 2014, are obtained from the annual statement in NAIC (National Association of Insurance Commissioners).We found some evidence supporting Emergency Fund Hypothesis and Interest Rate Hypothesis, but using different ways to calculate surrender rate may cause a little bias in conclusion. However, the relationship between surrender activities and macroeconomic variables supports insurance companies to understand and actively manage lapse/surrender risk.