The widely mocked project involved an 8-kilometer (5-mile) unrestored Xiaohekou section of the wall that has become known as the "most beautiful wild Great Wall."
Defensive works and guard towers were knocked flat as part of the project, officially launched to prevent further deterioration caused by the elements. Reports said sand and other materials were poured on top, protecting it but giving it the appearance of an elevated bike path running through steep forested hills.
"It really was an ugly repair job," Ding conceded.
The wall section built during the Ming Dynasty in 1381 lies in Liaoning's Suizhong county along the border with Hebei province.
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An official reached by phone at the government's Culture Bureau in Huludao city, which oversees Suizhong, said he had been told the restoration plan had been approved at the central government level by the State Administration of Cultural Relics.
Phones were not answered at county and provincial government cultural relics offices.
Many of the reports on the restoration lamented its inconsistency, with different materials, including lime, mortar and concrete, used in different places.
Dong Yaohui, vice chairman of the Great Wall Studies Society, called the restoration work "basic and crude."
"This sort of behavior is ridiculous," he added.
Online, commentators were scathing in their criticisms. China has passed legislation in recent years to protect the Great Wall, large sections of which have been bulldozed, pillaged for building materials or heavily restored and commercialized.