In response to the preference for flags of convenience, shipping countries have implemented offshore registries as second ship registers to prevent nationals from flying flags of convenience abroad. Korea likewise established the Jeju Special Ship Registration Zone system in 2003 to enhance the global competitiveness of its shipping industry, expanding its fleet. Various studies on ship registration mainly examine registration factors, ignoring the economic and policy effects on a country. Therefore, this study is the first to quantitatively evaluate the performance of the Jeju Special Ship Registration Zone system, employing the synthetic control method to analyze the effect of the system’s performance on the national economy. As a result of the analysis, the fleet increased to 42.16 million DWT out of 64.56 million DWT of Korean-flagged ships. Thus, Korea's shipping industry imports increased by 289 trillion won over 17 years from 2003 to 2019. Further, the effect of increasing the number of seafarers was 3714 persons. Hence, the policy continuation will benefit the Korean shipping industry and the national economy. The findings furnish useful grounds for evaluating policy effectiveness and continuity.

为应对方便旗的偏好，航运国实施了离岸登记作为第二船舶登记，以防止国民在国外悬挂方便旗。韩国也于 2003 年建立了济州特别船舶登记区制度，以增强其航运业的全球竞争力，扩大其船队。关于船舶登记的各种研究主要考察登记因素，而忽略了对一个国家的经济和政策影响。因此，本研究首次对济州特别船舶登记区系统的性能进行了定量评估，采用综合控制方法分析了系统性能对国民经济的影响。分析结果显示，在 6456 万载重吨悬挂韩国国旗的船舶中，船队增至 4216 万载重吨。因此，从 2003 年到 2019 年，韩国航运业进口在 17 年间增加了 289 万亿韩元。此外，增加海员人数的效果为 3714 人。因此，政策的延续将有利于韩国航运业和国民经济。调查结果为评估政策的有效性和连续性提供了有用的依据。