Since the 19th century， many scientists and explorers from China and other countries have been trying to unveil the Chang Tang， a mysterious land， but failed so far. Due to its special physical environment of being cutting off， the Chang Tang is normally very difficult to access， which makes the Chang Tang miraculous. None ofthe mysteries in human history， geography， biology and atmosphere physics has been deciphered entirely， though great efforts have been made. Our ancestors left with us the nature historic heritage full of questions-a treasure place attracting more and more explorers who vie for the first one to come.
