Purposes: To study the relation among self-concept, inter-personal relation and internet altruistic behavior. Methods: Adopt internet altruistic behavior scale, TSCS, inter-personal relation scale to test177 in-school undergraduates. Results: Difference of total score of internet altruistic behavior and its factor scores in students of different genders, grades and only child and child with siblings is not significant (p > .05). There are differences in major among dimensions of internet sharing and internet guidance (p < .05); and the scores of art students are higher than those of engineering students; psychological self has a significant correlation with internet supporting; social self has a significant correlation with total scores of internet altruistic behavior, internet supporting and internet reminding, but the total scores of self-concept have no significant correlation with the total scores of internet altruistic behavior and its factor scores. Internet altruistic behavior has a significant correlation with inter-personal relation.