Construction of the Great Wall first began in the seventh century BC. At that time, it was called Spring and Autumn Period (770-476 BC), The first section of wall, that appeared in China, was built by the Qi Kingdom and the Chu Kingdom. They had a high wall which was called “square wall” or “square city” surrounding their own territories to defend the attacks of their neighboring enemy. He invading enemy would feel terrified by the high wall, so it was also k90 the Qi Wall and the Chu Wall.
Starting from the Spring and Autumn Period, the frequent wars intensified until the Warring State Period (475-221 BC). After a series of annexations, seven states became the most powerful states (namely: Qj, Chu, Yan, Han, Zhao, Wei and in States), popularly called “Seven Powers in the Warring State Period.” In order to defend themselves and safeguard their territories against the infringing enemy from the neighboring states, all the kingdoms followed the example of State Qi and State Chu, and had ‘sections of high walls constructed around their own territories for self- protection. They built high walls at the strategic points of the north by making use o topographical advantages to protect their northern boundaries. The three states of Qin, Zhao and Yan, located in the north, had the high walls and fortresses built along their northern frontiers as defensive projects. These high walls were the primitive prototype of the present day Great wan and laid the foundation for present Great Wall.
In Chinese history, this is the largest project carried out in three dynasties that brought the climax of the development of the Great Wall. Large-scale construction of the Great Wall was concentrated: in the Qin, Han and Ming dynasties.