Electronic Clearance System in the Advanced Countries give sane hints Clearance System in Korea to improve. It is as follows. It is necessary to enhance the economical efficiency and rapidity on clearance system. It is important to improve the conveniency of importer and export through all day services in customs. It is necessary to control export and import goods efficiently for guarantee of security. Export entry data in export country has to linked with import entry data in import country to improve speedy, correctness, and efficiency. It is necessary to solve the security problems through the use of the latest cryptograph.