本研究為探討保險法中告知義務條款對於壽險公司及保戶之影響。藉由S公司之個案加以分類，透過不同個案類型與專家訪談作深入性之探討、整理分析，進而找出核保風險來源及可能的道德風險、逆選擇等因素，以提供壽險公司風險控管參考指標。若新契約參雜一些未告知或告知不實案件，事後又未提供可保性証明無法評估或拒保，導致契約效力被壽險公司解除契約；或保單生效已超過兩年，即使有解除之原因，亦不得解除契約之拒保案件，已威脅到保險公司經營風險。如何引進高品質的契約、降低補告知之發生率，實為各壽險公司核保部門之重要課題。為降低資訊不對稱案件的發生，探討目前相關法令與現今壽險業經營所面臨的風險與挑戰，並建議具體改善方案，以期有效改善壽險企業經營與法律環境之健全發展，最後分別針對保戶、壽險公司及主管機關提出建議，以供參考。 Taiwan’s Insurance Act has set forth provisions on policyholder’s duty of disclosure since it was first enacted. As the insurance environment evolves and the competent authority places great importance on consumer protection and the principle of consideration equity in the exercise of its regulatory and supervisory authority, existing regulations on the duty of disclosure which are designed based on the principle of good faith are under tremendous challenge. Insurance disputes associated with duty of disclosure have been at the top of consumer complaints. The number of cases where the policyholder provides supplemental information after obtaining coverage is directly proportional to the number of new policies issued. The author works as a risk control specialist for insurance underwriting. Whenever we receive supplemental disclosure from policyholders, we need to give such cases priority in processing, and if the supplementary disclosure could affect the results of risk assessment, we need to make the underwriting decision and notify the policyholder in one month after receiving the supplemental information. This paper explores the effect of the duty of disclosure clause in the Insurance Act on Life Insurance Corporations and policyholders. By classifying the cases of S Company and through in-depth examination and analysis of different types of cases and expert interviews, we attempt to identify the sources of underwriting risks and possible factors such as moral hazard and adverse selection, and provide the findings to life insurers as reference for risk management. If new policies issued contain some cases where important policyholder information is being withheld or only partially disclosed, and the policyholder fails to provide evidence of insurability or declines the insurance afterwards that the insurer has to cancel the policy, or a policy has been effective for two years and the insurer is not allowed to cancel the policy even if there are causes for cancellation, such cases greatly increase the operational risk of insurers. How to bring in high-quality insurance contracts and reduce the incidence of supplemental disclosure have become important topics for the underwriting department of life insurers. To reduce the incidence of information asymmetry in underwriting, this paper explores the prevailing laws and regulations as well as risks and challenges faced by life insurers, and propose concrete suggestions for improvement in the hope to effectively improve the business operations and legal environment of life insurers. Lastly, the paper makes suggestions respectively to policyholders, life insurance companies and the competent authority for their reference.