決定自留額是保險人承接業務時之主要考量因素，以發揮保險之基本原理原則：危險分散與損失分攤。自留額釐定不當，不僅影響保險人財務結構，甚至波及公司整體核保營運成果而危及清償能力。本文選擇某產險公司實際損失分配資料，探討不同自留比例與再保方式對營運結果之影響，結果顯示在此實際損失分配資料模型下，適度調高自留比例，應可增加核保利潤。本文進一步以相關性分析探討自留配置。 / Retention is a key element for the insurer to determine how much it wishes to retain for its own account for the risks it has written. This point is fundamental to carrying on the business of insurance and akin to the principle upon which insurance is based, namely the spreading of risks and sharing of losses. The risk of incurring a retained loss owning to inadequate retention, which would imperil financial objective even can affect the overall underwriting results and arise insolvency. This paper select data base of occurred loss distribution for the past three years to study the impact of different retained ratio and different type of reinsurance for performance. This paper shows that, the underwriting profit can be expected to increase when the retention increases precisely under the existing loss distribution model . This paper also discuss the related factors in deciding retention by correlation analysis.