Late September 2020 to June 7, 2020. The activity of answering questions about national defense education knowledge in ordinary primary and secondary schools in Shandong Province continued until the middle of 10. Preliminary stage (from late September 2020 to June 7, 2020). Participants log on to the official account of the public daily WeChat to answer questions online, and each contest randomly selects 5 questions. The answer time is 90 minutes, with full mark 100. Holding a question-and-answer activity on national defense education can carry out national defense education for the whole people and create a good atmosphere for the whole society to care for, love, build and defend national defense.