Dragon Gate, also known as Dragon Gate Mountain, is said to be the place where Yu the Great tamed the floods. After guiding the waters of the Yellow River to Dragon Gate Mountain, Yu found that the water had no way out. So, he carved an opening in Dragon Gate Mountain for the waters of the Yellow River to flow through. Not only were the sides of the opening very steep, the river flow was also swift and strong. The narrowest part of the opening was barely sixty meters wide. This made the mountain look like the gate of the Yellow River.

After carving an opening in Dragon Gate Mountain, Yu wanted to find a fish that could leap over the Dragon Gate to manage  the place. Upon hearing the news, many fish wanted to try for the position, so, they all swam up the Yellow River toward Dragon Gate Mountain. Along the way, some of the weaker fish became tired, and were washed away by the strong river current. Only a few fish finally made it to the foot of Dragon Gate Mountain. They kept trying to jump over the gate, but none succeeded. One by one, they gave up and swam back to the sea.

Eventually, only one tiny golden carp was left. It tried its best to jump over the gate until it was exhausted and about to give up. Suddenly, it noticed a huge rock in the middle of the river. When the water hit the rock, it sent spray high up into the air. The tiny carp suddenly had an idea, “Why should I rely only on my own strength to jump? Why not use the power of the water? ”

And so, the little carp rode upon the spray, and leaped into the air as high as it could. Unexpectedly, it leaped over the Dragon Gate, and landed effortlessly on the other side of the mountain. In the end, the little carp was not only appointed as the caretaker of Dragon Gate Mountain, it was transformed into a golden dragon that flew happily in the sky.

龍門，就是龍門山，傳說是大禹治水，把黃河的水引到龍門山後，發現沒有地方可以讓水流出去，就把龍門山鑿開，讓黃河從中間流出，兩邊的山勢不但陡峭，水流也很湍急，最窄的距離只有六十多公尺，看起來就像黃河的門一樣。

大禹鑿開龍門山之後，想要找一條能跳過龍門山的魚兒來管理這個地方。很多魚聽到消息後，都想試試看，於是大家一起沿著黃河往龍門山游去。一路上，有的魚因為體力不夠，被河水沖走；好不容易游到龍門山下了，有的魚卻又因為不斷的失敗，選擇游回大海。

最後，只剩下一條金色的小鯉魚還在努力跳著，在牠累到想放棄的時候，忽然看到河裡有一塊大石頭，河水一打在石頭上，濺起來的浪花就飛得好高好高。小鯉魚忽然有一個想法：「我為什麼只靠自己的力量跳呢？為什麼不利用水的力量呢？」

於是小鯉魚先跳到浪花的頂端，再靠尾巴的力量往上跳。沒想到牠竟然跳過龍門山，輕鬆地落在山的另外一邊。最後，這條小鯉魚不但能管理龍門山，更變成一條金龍，在空中開心地飛著。