In order to let students know more about the National Security Law, a series of activities was held in April this year for the National Security Education Day dated 15th April. A National Security Education lesson was held on 14th and 21st April for S1 and S2 classes respectively. For S3 students, a lesson about the National Constitution was held on 28th April. In the lessons, a video clip about the National Security Law or the National Constitution was played with a Q&A game followed. A flag-raising ceremony was also held to teach students the etiquette needed. Moreover, on the National Security Education Day dated 15th April, all S1 students joined an online Q&A competition and our Basic Law Ambassadors joined a webinar discussing the National Security Law with the students in Macau. An exhibition located outside the hall with a quiz game was also carried out from 14th to 21st April. Through these activities, students could be able to understand the importance and the content of the National Security Law imposed in Hong Kong.