The main purpose of this study was to implement the instant influences and the suspend influences on the instructions of the happy story and the compassionate story to the positive emotion among the elementary graders. The objects of the study were three four-grade classes of an elementary school in Tainan. The experiment group A carried out the instructions of the happy story. The experiment group B carried out the instructions of the compassionate story. The eighty-eight students in the experiment group took the nonequivalent quasi-experimental design. The quantification research data were analyzed by Ya-Jane Chaung's ”Children's Positive Emotion Inventory” and the Paired-Samples t Test and Analysis of Covariance were used to analyze to the collected data. The results of the study were concluded as follows: First, after the instructions of the happy story among the four-grade elementary students, the results of the positive emotion of the students indicated they had immediate effects, but no delayed effects. Second, after the instructions of the compassionate story among the four-grade elementary students, the results of the positive emotion of the students did not indicate they had both immediate and delayed effects. Third, after the instructions of the happy story and the compassionate story among the four-grade elementary students, the results of the positive emotion showed the differences on ”the pleasure” and ”the entire positive emotion”, and the happy-story group was better than the control group in post-test; the differences on ”the contented mood” and ”the confident mood”, the happy-story group was better than the compassionate-story group in the delayed effect.