After arriving in Golden Triangle Special Economic Zone in Bokeo province in Laos on May 7, Yue Junwei, on-site design supervisor, went to the site to get first-hand information in accordance with the requirements of supervision outline, finally studied and solved on-site technical problems by holding many technical seminars. On May 17, the route scheme was determined. He finished the professional survey on-site supervision of first paragraph of 23 km up to May 22, and complished measurement of cross-section about 1/4 of the first section and supervision of 15 on-site reconnaissance drilling on May 25. The whole work was successful.