The subject of this thesis was to investigate the correlation on the information ability and the behavior of Internet use for the fourth-grade students. Total nine dependent variables were involved in the study, such as gender, years of use, average time for access Internet each week, site of use, parents’ attitude, motivation and purpose, functions of Internet, method to learn and satisfaction of use in Internet. The “basic Internet ability tests” was employed as a research tool and participations of the 236 fourth-grade students was evaluated for information ability. Three conclusions gained in the study were listed as bellows: 1. With the exception of gender, years of use, average time for access Internet each week, site of use, parents’ attitude, motivation and purpose are something to do with information ability. 2. Functions of Internet in use are connected with information ability on exclusion of game download. 3. Method to learn appears a closed correlation with information ability, especially, asking for help from parents.