本文以“明代北直隶府州县城门与朝鲜时代韩国城门比较研究”为题，旨在分析行政区划与地理环境对城门的影响。整理地方志中关于城郭平面、城门方位、附属设施有无等的记载，并结合舆地图及其他相关文献，详细的分析城门结构，是本文采用的一个研究方法。中国土地广阔，各省的地理不同，以明代北直隶地区为个案，研究不同等级行政区划的城郭与城门的设置所显示出的等级关系及受到的自然地理环境因素的影响，具有代表性，对研究同时期其他地区的城门有一定的推动促进作用。明代北直隶，即明代的京师，领8府，2直隶州，17散州，15卫，12所，2镇，116县。都城由于其政治功能，修建时布局规划特别讲究古代礼制，都城下辖的府州县等行政区划的城郭在城郭平面、城门位置及方位、城门秩序、城门结构及形制方面因受自然环境因素的影响而发生变化。韩半岛土地面积虽小，但地形多样，这对城市及城门有一定的影响。对比起来，韩半岛的城郭数量少，较易进行统计，从文献中梳理有关城市，以现存城市城郭为中心，分析不同地理环境下的城郭及城门的情况。

My Thesis is about the study on the city gates in the cities of Beizhili, belonged to Fuzhouxian, one of the administrative districts in the Ming dynasty, together with comparative study of the city gates between the cities in the Ming dynasty and South Korea in the Joseon dynasty. I mostly focused on how topographical environment and city scale affected the structural form and size of a city gate. Besides, based on the historical records and other relevant materials relating a city planning, city gate, and its subsidiary structures, I surveyed the architectural structure of a city gate. Since the land of China is very big and there are many cities spread all over the country, it took a quite long time for me to reach to the conclusion of the study.Beizhili was the one of the political centers in China, and put great importance on conventionalized principles when a city was built. Probably, it might have been caused that many other places in China also took the model of Beizhili in the construction of a city. In that context, this study will provide future researchers with a broader perspective on the same issue with other places in China. Korea in the Josen dynasty, unlike China, had much less cities, but I still divided them into a few categories in the basis of their scale and geographical conditions, and did further study on the stylistic features of city gates in a different category. The number of city gate in a Korean city has significant difference with that of a Chinese city, but it is common that they both get affected by the scale of a city, for example, the smaller a city became, the smaller a city gate was. In addition, the natural environment, which surrounded the city gates both in China and Korea, were used to strength its power of defense.