Qingfeng, a Beijing-based chain known for its steamed buns, has seen a 40-percent increase of business since an unexpected visit by President Xi Jinping late in December to one of its branches, a legislator said on Wednesday.

Zhu Yuling, head of the State-owned Beijing Huatian Catering Group Corp, which owns the Qingfeng chain, said the 183 Qingfeng restaurants have witnessed long lines of diners waiting to order its steamed buns.

Zhu, a Beijing legislator, made the remarks during the ongoing two sessions of the Beijing People��s Congress and the Beijing Committee of the CPPCC.

He said the Qingfeng restaurants will pay attention to their food quality, rather than blind expansion.