Through personal growth experiences, the profound impact of the Constitution on personal life has been demonstrated. The author gradually developed a comprehensive understanding of the Constitution, from a preliminary understanding of the Constitution during elementary school, to a deep understanding of the importance of the Constitution through his father's constitutional knowledge class at school, and then to an understanding of the rights and obligations protected by the Constitution as an adult. The author emphasizes that the Constitution is the cornerstone of ensuring a happy life for the people, accompanying everyone from birth to growth, from learning to work, from family to society at all stages. By promoting constitutional knowledge to others in the Constitution Book section of the bookstore, the author demonstrates their role as a disseminator of constitutional knowledge. Finally, through the example of requesting invoices, the author illustrates the practical application of the Constitution in daily life, emphasizing that citizens should respect the law, abide by the law, and use it, and become excellent little citizens.