An, Soyoung. 2018. “An Analysis of University Students' English-Learning Motivation Change through Portfolio Assessment”. The Sociolinguistic Journal of Korea 26(1). 251~275. This study aims to analyze university students' English-learning motivation through making a learning portfolio. I conducted an experiment to know whether motivation could be changed by different assessment systems, a result-oriented assessment and a process-oriented assessment. First, there were no statistically significant differences in English-learning motivation between the two groups subject to a result-oriented assessment and a process-oriented assessment by independent T-test. Second, the variable “attitudes toward learning English” significantly changed when students created a learning portfolio by paired T-test. Students showed their preferences for studying English through an authentic learning portfolio method. Therefore, even though the new assessment system such as a portfolio assessment brings us innovation, the assessment system had a partial impact on students' English-learning motivation.