The purpose of this study was to investigate the factors that influenced the mobile-assisted language learning (MALL) environment. To do so, seven constructs which included personal factors (attitude, metacognition), social factors (subjective norm, interactivity), and cognitive factors (perceived usefulness, perceived ease, content reliability) were selected. A questionnaire was developed to measure the constructs of MALL. A total of 194 university students were surveyed in the spring semester of 2018, and data were analyzed using exploratory factor analysis. The results of data analysis were classified into five influencing factors, which were different from the ones originated by previous studies, and the question items of each factor also showed a different aspect from the original question composition of previous studies. As a result of analyzing the correlation among the new factors, all factors except subjective norms showed more than medium levels of positive correlations, and the correlation of each pair was statistically significant. This study suggests the instructional ways to utilize influencing factors of MALL and develop measurement tools as well as offers pedagogical implication for language teachers, students, and system designers.