This study is to evaluate the effect of roleplaying-centered STS program on the science-related attitude, the academic achievement, and the problem solving ability in "Environment" unit of high school Science. 90 students in grade 10 were divided into two groups, the experimental group applied the roleplaying-centered STS program and the control group applied the traditional lecture-centered class. The pretest was implemented to measure the science-related attitude, and the posttest was implemented to measure the science-related attitude, the academic achievement, and problem solving ability. The collected data were analyzed by ANCOVA and Correlation Analysis with SPSS program. The results are as follows: First, the experimental group was not significantly different from the control group in the science-related attitude and in the academic achievement(p>.05). Second, the experimental group significantly showed much better problem solving ability than the control group(p<.05). Third, a significant correlation was recognized between the academic achievement and the problem solving ability(p<.01).