In 1990–91, he led the UNESCO international scientific teams for the Desert Route Expedition of the Silk Road in China and the Steppe Route Expedition of the Silk Road in the Soviet Union.
1990-91年，他带领教科文组织国际科研团队，进行中国丝绸之路沙漠路线考察和丝绸之路苏联段草原路线考察。