The activity conscientiously studied and implemented the important speech spirit of the Chairman's provincial and ministerial level main leading cadres seminar, polished and refined the lectures according to the 16 special topics in the Q&A, and interpreted the micro lessons around the hot topics concerned by officers and soldiers. The theoretical service follows the principle of being convenient nearby. The troops in the same camp of the experts' colleges are selected for spot service. Online teaching and online service are adopted to expand the scope of theoretical service and explore the way of theoretical service under the conditions of normalized epidemic prevention and control. On the occasion of the victory of the Twentieth National Congress of the Communist Party of China (CPC), carrying out the activity of theoretical service at the grass-roots level is of great significance to guide officers and soldiers to deeply understand the decisive significance of "two establishment", strengthen the "four consciousness", strengthen the "four self-confidence", achieve "two maintenance", implement the CMC chairman responsibility system, and constantly open a new era for the cause of building a strong military. Deepen and Live Innovation Theory ■ Special correspondent of PLA Daily Tong Zujing Correspondent Zhao Miao and Chen Yuhan Yu Hong, a member of the theoretical service grassroots activity group of the Political Work Department of the Military Commission and a professor of the Army University of Engineering, shared a micro lesson with the theoretical backbone of the brigade around the "profound understanding of the decisive significance of the" two establishment ". True knowledge can make you believe, and learning can make you understand. As academic experts participating in the compilation of Q&A, Yu Hong and Wu Diming, a professor of the Naval Command Academy, closely followed the situation and task, accurately explained the theory, and explained the decisive significance of "two establishment". In order to accurately explain the deep connotation based on the actual situation of the troops, Wu Di ming fully understood the development history and tasks of the brigade before teaching. After observing the tactical action drill of the chemical defense platoon for artillery position support, he told the officers and soldiers about the old generation of chemical defense soldiers