This research is entitled The Effectiveness of Mind Mapping Strategy on Students' Mathematical Concept Understanding. This study aims to determine whether there is an Effectiveness of Mind Mapping Strategy on Understanding Mathematical Concepts of Students at STMIK Royal Kisaran in Linear Algebra Course. The population in this study were all students of the STMIK Royal Computer System range. This research is an experimental study involving 35 students from SK 2A to Experiment class and 35 students from SK 2B to control class. Based on the results of hypothesis testing, the value of dan , then . This states that there is an Effectiveness of Mind Mapping Strategy on Understanding Mathematical Concepts of Students at STMIK Royal Kisaran in Linear Algebra Course.