Previous studies on the influence of family support on college students' academic performance have yielded inconsistent results. Therefore, the present study aimed to examine the link between family support and students' university-level academic performance in a more detailed way. First, we sought to clarify how two distinct aspects of perceived family support-social support and economic support-affect college students' academic performance. Second, we sought to determine how these two aspects of family support influence not only cumulative GPA scores but also the overall trend (slope) and stability (variability) of students' GPA scores across semesters. The participants in this longitudinal study were 240 university students (62 men, 178 women). The results revealed that the level of perceived family social support was important not only as a "main effect" predictor of the magnitude and stability of their GPA scores across three successive semesters, but also as a factor that helped female students to succeed regardless of their level of family economic support. In general, the data suggest that family social support is more important to women's success in college than to men's. How is family support related to college students' academic success? To date, a number of studies have investigated the influence of family support on college students' academic performance. However, the results of these studies have revealed somewhat inconsistent effects.Some of these studies have reported non-significant associations. For example, Carlstrom (2005) found no significant relationship between the perceived availability of family support and college students' academic functioning. Similarly, studies by Spain (2008) and by Roman, Cuestas, and Fenollar (2008) both reported a non-significant relationship between family support and college students' academic achievement, although Roman et al. (2008) found that family support was significantly associated with students' self-esteem and certain aspects of learning approaches (i.e., deep processing and effort) that were positively correlated with academic achievement.Other studies have reported weak-but-significant associations between family support and college students ' GPA scores. For example, Alnabhan, Al-Zegoul, and Harwell (2001) investigated factors that influenced student performance in the education department at Mu'tah University in Jordan. Using factors derived from principal-axis factoring and orthogonal rotation, they found that the lack of family support weakly predicted lower university GPA scores, (r = .09). In another relevant study, Babaoye (2001) observed that family support was cited by black college students as a factor relevant to their academic performance, but provided no measure of statistical association that would enable us to estimate the size of its effect.