Zhongshan Bridge which lies at the foot of Baita Mountain of Lanzhou City is well known as the First Bridge over the Yellow River. In fact, before Zhongshan Bridge was constructed, there were many bridges over the Yellow River but none of them existed a relatively long period. The bridge was made up of over 20 ships which were tied up by ropes and chains in order for the people to across the river at the first place. However, this method was not a good idea for a long run as the ship-made bridge would be destroyed annually when the flood occurred at Yellow River. Moreover, when winter comes, the river would turn into ice and indirectly caused destruction to the ship-made bridge on the other hand. Thus, the bridge would need to undergo a costly renovation projects in the spring in order to the bridge to continue to serve the people. Finally in year 1909, the floating bridge was retired and replaced by an iron bridge. This bridge was renamed as Zhongshan Bridge in year 1942 in order to commemorate Dr. Sun Yat-sen. Anyway, the servicing life of this iron bridge had come to the end in year 1989 and during this time, it was no more the only bridge that built across Yellow River. However, no one can replace its great value in the development history as well as its great contribution to the society throughout the 80 years of servicing period. Nowadays, the bridge is known for a tourist spot which allows people to recall the history of that period.