This study aimed to develop instructional packages using a growth mindset framework to enhance positive psychological capital among students of the Faculty of Education, Kasetsart University. The sample consisted of 30students enrolled in the course on Educational Psychology and Guidance for Teachers, selected by purposive sampling. The research employed a positive psychological capital scale and a feedback questionnaire on the activities. Statistical analysis included mean, standard deviation, and the wilcoxon signed-rank test. The results indicated that the instructional packages effectively enhanced positive psychological capital, with the mean score increasing from 3.93 to 4.24, which is at the highest level. The wilcoxon signed-rank test showed that the p-value was less than 0.05, indicating that these iprovements were statistically significant at the 0.05 level. Additionally, students' feedback on the activities was positive, indicating that the activities helped enhance self-understanding, motivation, and a more positive outlook on themselves and their lives.