The research objectives were (1) to study the factors affecting the development of hope of college freshman students in Guangxi International Business Vocational College. (2) to develop curriculum based on the happiness theory. (3) to compare the hopes of college freshman students before and after learning by curriculum based on the happiness theory. With a carefully selected sample of 35 students from the first-year Thai class at Guangxi International Business Vocational College, researchers conducted a thorough analysis of various factors affecting students' hope. A range of research tools was utilized, including (1) a questionnaire about the factors affecting the development of hope level. (2) interview form about influencing factors of hope level. (3) lesson plans. (4) the Hope Scale. (5) observation form about student behavior. (6) interview form about opinions on teaching. This study was conducted in 3 steps: (1) study the factors affecting the development of hope. (2) develop curriculum based on the happiness theory. (3) experiment and improvement of curriculum model. The results of the study showed that: (1) factors that affect the development of college students' hopes include personal factors and environmental factors. Personal factors are related to goals thinking, pathways thinking and agency thinking, and environmental factors include family, school, and society. (2) The curriculum based on happiness theory includes 6 elements: principle, goal, contents, and time, learning process, learning resource, and Evaluation. The learning process in the curriculum includes 4 processes: positive emotion, engagement, relationship, meaning, accomplishment, and present. (3) students' hope is improved after the implementation of the curriculum based on happiness theory. This change was statistically significant, especially at the level of 0.1.