This study examined change in Chinese students' autonomous learning motivation in the first three years of college and how this change is accounted for by intra- and inter-individual variables. The sample included 633 (328 female) college freshmen. Results showed that students' autonomous learning motivation decreased over years in college. Students' perceived parental autonomy support and peer relatedness demonstrated different change patterns over time, but each variable positively predicted students' autonomous learning motivation. Students majoring in science showed a more rapid decline in motivation than liberal arts students. Students studying a major of their own choice showed a higher initial level of motivation than students who were studying a major not of their own choice, but no group difference in the declining trend of motivation was observed. The positive effects of students' perceived institutional support on motivation were limited to the freshmen year. (Contains 1 figure and 2 tables.)