Recently, as learnt from the Cultural Relics Bureau of Shandong, the investigation work of Qi Great Wall has gained some progress, through which people would have a better understanding of the Qi Great Wall.

In the first place, the western starting point of the double line of the Qi Great Wall at the junction of Changqing District in Ji'nan City and Feicheng City in Tai'an was reconfirmed and extended more than 1,400m westwards through field survey and investigation. During the investigation, it is found that the style and construction way of the walls are the same as that of the mainline Great Wall, but poorly conserved. There are only some remaining traces in some sections along the line. Meanwhile, great efforts have also been made on the investigation of the boundary zone of Changqing City and Feicheng City and the mountain ranges the Great Wall has ever possibly covered. Finally, it is concluded that the Qi Great Wall never runs through these areas and the purported Great Wall on the Niushan Mountain and Taoshan Mountain turned out to be the walls of the late mountain fastness at that time.       

Secondly, a 700-meter-long east-west trench has been discovered and confirmed in Changqing District. The trench is located in the flat land of the valley with a width of over 20m and a depth of more than 10m. Different from the naturally-formed gulch in the valley, the eastern and western ends of the trench match along with the walls on the hillside. From the interviews with the villagers in Changqing, we learnt that there were still some tall earthen walls in the north of the trench in the 1960s and 1970s, which was identified preliminarily as the trench outside the walls of the Qi Great Wall.
 
Besides, three ancient sites from the Zhou Dynasty were discovered inside the Great Wall, two of which are found on the top of the mountain the Great Wall ever runs through and the rest one is located on the hillside of the remote mountains with steep stony cliff underneath. The ancient sites cover an area of about 400 square meters to 5000 square meters. There are a mass of pottery shards, which were passed down from the late Spring and Autumn and Warring States Period. The sites are preliminarily identified as related to the guard of the Great Wall. The discovery of the sites would provide evidence for the identification of the time when the Qi Great Wall was first constructed and used.   

The construction of the Qi Great Wall in Shandong Province began in the Spring and Autumn Period and finished in the Warring States Period, running through Jinan, Tai'an, Ziboy, Laiwu, Weifang, Linyi City, Rizhao and Qingdao and stretching as far as hundreds of miles away. 490 years earlier than the Qin Great Wall, the Qi Great Wall is the most ancient extant Great Wall section in China.