In 2021, the annual event will strengthen the communication with international trenchless industry (and latest technology); enhance international participation, academic authority, as well as the latest domestic and international trenchless technology exchanges. Besides, the annual event will provide a more qualified platform for companies, universities, research institutions to announce and discuss their latest products, technology, management strategies and so on. We aim at modeling a seminar brand well-recognized in our nation and even in Asia. The association expects to make mutual development which lives up to the congregation of all members and prosperity of the industry. Hereby, we sincerely extend our invitation to all the relevant companies and specialists in the trenchless technology industry to participate in our conference and visit the exhibition.