The purpose of this study was to determine the effect of information mapping strategy on mathematics conceptual knowledge of junior high school students in Rokan Hulu Riau, Indonesia. The study also examined the relationship between mathematics conceptual knowledge and mathematics achievement. Using a quasi-experimental method, the study was carried out on 132 students from one junior high school in Rokan Hulu Riau, Indonesia. It was completed in 6 weeks. Instruments used in this study were mathematics conceptual knowledge test and mathematics achievement test. The results of this study indicated that there were significant differences in mathematics conceptual knowledge between the information mapping strategy group and the traditional group. It was concluded that using information mapping strategy may impact students' conceptual knowledge. There was a relationships between mathematics conceptual knowledge and mathematics achievement. (Contains 4 tables and 1 figure.)