Looking at rapeseed in summer, it is inevitable to go to Qinghai Lake and Menyuan in the northwest. In recent years, it has become a popular tourist attraction because of the famous reputation of rapeseed in July and August. From the door source to the north, after the Qilian Mountain, it was in Gansu, and the Pingdukou of Zhangye Minle County was the first stop. Biandukou is 30 kilometers away from Minle County and about 90 kilometers from downtown Zhangye. Compared with Qinghai Lake and Menyuan, the reputation here is not so big, many tourists do not know, the scenery is not bad at all. This road from Qinghai to Gansu has been very famous since it was more than 2,000 years ago. It is a strategic location. In the history of the Biandu Gorge, it was called Dadou Baugu. In the period of Emperor Wu of the Han Dynasty more than 2,000 years ago, Zhang Wei sent the Western Region from here, and Huo went to the disease to lead the Han family to expel the Huns from here. Huo went to the disease and built a military horse farm in Shandan, not far from the Pingdukou. It has existed for more than 2,000 years. The terrain of Biandukou is not flat. It is a hilly hill with high and low undulations. There are several viewing platforms on the hill. It is free to open. The middle and late July is the most beautiful season of rape, and large rapeseeds are mixed with green grass. Together, the flock is free to stock. The G227 national road connects the Gansu and Qinghai provinces and crosses the Qilian Mountains. The rapeseed flowers are opened on the hills on both sides of the road. It is most convenient to drive to the flat mouth.