In 1935, Hedin made his exclusive knowledge about Central Asia available, not only to the Swedish government, but also to foreign governments such as China and Germany, in lectures and personal discussions with political representatives of Chiang Kai-shek and Adolf Hitler.
Although Hedin's research was taboo in Germany and Sweden because of his conduct relating to Nazi Germany, and stagnated for decades in Germany, the scientific documentation of his expeditions was translated into Chinese by the Chinese Academy of Social Sciences and incorporated into Chinese research. Following recommendations made by Hedin to the Chinese government in 1935, the routes he selected were used to construct streets and train tracks, as well as dams and canals to irrigate new farms being established in the Tarim and Yanji basins in Xinjiang and the deposits of iron, manganese, oil, coal and gold discovered during the Sino-Swedish Expedition were opened up for mining. Among the discoveries of this expedition should also be counted the many Asian plants and animals unheard of until that date, as well as fossil remains of dinosaurs and other extinct animals. Many were named after Hedin, the species-level scientific classification being hedini. But one discovery remained unknown to Chinese researchers until the turn of the millennium: in the Lop Nur desert, Hedin discovered in 1933 and 1934 ruins of signal towers which prove that the Great Wall of China once extended as far west as Xinjiang.
For the return trip, Hedin selected the southern Silk Road route via Hotan to Xi'an, where the expedition arrived on 7 February 1935. He continued on to Beijing to meet with President Lin Sen and to Nanjing to Chiang Kai-shek. He celebrated his 70th birthday on 19 February 1935 in the presence of 250 members of the Kuomintang government, to whom he reported interesting facts about the Sino-Swedish Expedition. On this day, he was awarded the Brilliant Jade Order, Second Class.
At the end of the expedition, Hedin was in a difficult financial situation. He had considerable debts at the German-Asian Bank in Beijing, which he repaid with the royalties and fees received for his books and lectures. In the months after his return, he held 111 lectures in 91 German cities as well as 19 lectures in neighboring countries. To accomplish this lecture tour, he covered a stretch as long as the equator, 23,000 kilometres (14,000 mi) by train and 17,000 kilometres (11,000 mi) by car—in a time period of five months. He met Adolf Hitler in Berlin before his lecture on 14 April 1935.