This study aims to investigate the trend of elementary pre-service teachers’ science education research, particularly by extracting keywords from summaries of academic journal-registered theses (candidates) in KRF (Korea Research Foundation) and analyzing keyword networks. As a result of analyzing the centrality of keyword networks, this study discovered that there were some differences in the number of keywords and total links by the number of theses, between two different periods when subject matter curriculums of the 2009 and 2007 Revised Science Curriculum were applied respectively, but the density and the average number of connections remained similar between the two periods. When conducting analyses of degree centrality and betweenness centrality, this study found out that the keyword, ‘Elementary Pre-service Teacher’, was highest in both the periods, followed by ‘Misconception’ during the period when subject matter curriculum of the 2009 Revised Science Curriculum was applied, and ‘Perception’ and ‘PCK’ during the period of when subject matter curriculum of the 2007 Revised Science Curriculum was applied. As a result of analyzing components focusing on the keyword,‘Elementary Pre-service Teacher’, 1 large-sized component and 4 small-sized components were found in the period when subject matter curriculum of the 2009 Revised Science Curriculum was applied, while 1 large-sized component and 7 small-sized components were found in the period when subject matter curriculum of the 2007 Revised Science Curriculum was applied. Interestingly, there were as many as 7 small-sized components formed in the period when subject matter curriculum of the 2009 Revised Science Curriculum, and it may indicate that various researches with different topics were conducted only to pursue research creativity during this period.