The purpose of this study was to investigate the relations between happiness and examination scores of elementary school students in high grades, as well as to discuss the influence of Happiness Intervention Program. The study adopted quasi-experimental design method, and purposive samples are respectively the four classes of the fifth and sixth grade students in Taoyuan city, randomly assigned two classes to be the experimental group in propotion with gender in the fifth and sixth grade, and the rest of them to be the control group, and both are 208 people. The experimental group received seven weeks of “Happiness Intervention Program”, but the control group didn’t. On the last week, 208 questionnaire survey were sent and 191 valid ones were received, with a responding rate of 91.82%. The results demonstrated as follows: 1. Happiness was positively related to examination scores. 2. Happiness Intervention Program can elevate the sense of happiness. According to the results and conclusions of this study, some suggestions were offered as references for further study in the future.