50 years ago a group of young people drove the timber pole into the ice and snow-topped Qinghai, Tibet Plateau, beginning a dream to build a railway on the ridge of the world. But the dream was broken in front of the harsh natural environment and young member of the survey party was left htere forever. 20 years later, his post humous son, Yu Mingyuan, came to the plateau with the railway builders to build the railway again. However, wehn they laid the railway track to the foot of the Kunlun Mountains with their blood and lives, they had to give up again., The Kunlun Mountails devoured his fellow builders and his first lover. 24 more years pass. The middle aged Yu Mingyunan led the reailway builders to the Qinqhai, Tebet Plateau again for the final dicisive battle in building the railway. Chu Ranran, an expert of altitude sickness, came with them. the advanced facilities, such as Hyperbaric oxygen chambers and the scientific and technical means ensured the health conditiona and promothed the efficiency of building the railway. To his suprise, Yu found that Chu Ranran was the image of his first lover......