BEIJING - Three famous Chinese tourist spots were warned by the industry regulator Saturday for deteriorating quality.

The Old Town of Lijiang in Southwest China's Yunnan province was required by the China National Tourism Administration (CNTA) to improve management within six months.

As a 5A-level national tourist attraction, or the top level, the Old Town of Lijiang was subject to rising complaints and poor security, the CNTA pointed out after inspecting 5A-licensed tourism spots.

China has recently delisted three 5A tourist attractions and warned 19 others, while 20 attractions were added to the 5A category.

China has a tourism-rating classification system which rates a tourist attraction from one A to 5A for its overall tourism quality.