Purpose: During more than 70 years of division, exchange between the two Koreas was rare and academic heterogeneity deepened. This study aims to analyze changes and characteristics of environmental architecture research in North Korea through an architectural journal published in North Korea. Method: In this study, about 2,000 papers published from 1990 to 2018 in <Chosun Architecture>, a representative architecture journal in North Korea, were analyzed to analyze trends in eco-friendly architecture research by period and subject.The terminology, article description style and change of research subject in environmental architecture were reviewed and characteristics were summarized. Result: First of all, research themes on residential buildings focused on thermal environments and studies on acoustics and light environments mostly focused on public buildings. In particular, as for the thermal environment, many studies were related to thermal insulation and natural solar energy storage. Second, the research method was described in the form of an essay, and the results were obtained by formulas and calculations rather than experiments or simulations. Third, in relation to the floor plan of the residential building, there have been designs that reduced heat loss through insulation rather than the quality of life. Fourth, although the latest architectural trends such as ecological architecture and zero energy were introduced, it was found that their implementation were insufficient compared to South Korea or other countries.