China Ancient Capital Society recently recognized Kaifeng as the capital of Xia Dynasty, which promoted Kaifeng, known as the "city of seven dynasties", to the "ancient capital of eight dynasties", and its earliest construction time was greatly advanced. They are Xia Dynasty, Wei State, Hou Liang, Hou Jin, Hou Han, Hou Zhou, Song Dynasty and Jin Dynasty. Kaifeng was called Bianjing, Bianliang and Bianzhou in ancient times. Kaifeng has a history of more than 4000 years. Kaifeng is the birthplace of Henan Opera in China and the first batch of national historical and cultural cities. Kaifeng is located in the east of Henan, the hinterland of the Central Plains and the bank of the Yellow River. It is one of the three areas of China Pilot Free Trade Zone.