This study aimed to compare mathematics learning achievement entitled Parabola, attitude towards mathematics, and analytical thinking abilities of Mathayomsuksa 3 (grade 9) students between organization of activities using the Geometer's Sketchpad Program as media and organization of activities using conventional method. They were assigned into an experimental group of 38 students who learned using organization of learning activities by the use of the Geometer's Sketchpad Program, and a control group of 39 students who learned using the conventional organization of learning activities. The research instruments used in the study included 12 lesson plans for organization of activities using the Geometer's Sketchpad Program and 12 lesson plans for conventional organization of activities., a 30-item of multiple-choice mathematics achievement test, a 30-item analytical thinking ability test, and a 30-item scale on attitude towards mathematics. Mean, standard deviation, Pearson correlation (r_xy), t-test (independent samples), and Hotelling's T² were employed for testing hypotheses.² The findings revealed that students who learned using organization of activities by the use of the Geometer's Sketchpad Program as media had higher attitude towards mathematics learning than those organization of activities Using conventional method at the.05 level of statistical significance. In addition, students who learned using organization of activities by the use of the Geometer's Sketchpad Program as media had higher mathematics achievement entitled, Parabola and more analytical thinking abilities than those who learned using the organization of activities using conventional method at the.05 level of significance. © 2009, INSInet Publication.