This study aims to present definite directions on practical insurance business and letter of credits through an analysis centering on each section of Article 28 of UCP600. Accordingly, we sought adefinite understanding of regulations on insurance documents and present things to be improved. And we speculate the issues on insurance documents focusing on excessive involvement of insurance in banking according to the convention of insurance business, each mortgage having liability according to contract based on the regulations on acceptance of collective insurance documents, problems in acceptance of expiry date recorded in insurance documents and alternatives. This study focuses on activation of insurance documents as contract documents of marine insurance, aiming to present interpretational base in a practical view rather than technological directions.