This study aimed at investigating the effect of using GeoGebra software on mathematical problem solving and mathematical anxiety among the basic tenth grade students. A test of mathematical problem solving was used in this study, compromised of (15) items. Also a scale of mathematical anxiety was used, compromised of (20) items. Validity and reliability of the two scales were established. The subjects of this study were (64) tenth grade students, selected from basic governmental school in Nablus district, in the scholastic year 2012-2013. The study revealed an effect of GeoGebra software on improving the achievement of the students in mathematical problem solving and reducing the level of mathematical anxiety in favor of the experimental group. A number of recommendations were made in the light of these findings.