BEIJING, March 5 -- China faces great challenges and complex problems in pushing forward economic and social development, Premier Li Keqiang said on Wednesday at the opening of the annual session of the National People's Congress, China's top legislature.

"The foundation for sustaining steady economic growth is not yet firm, and the internal impetus driving growth needs to be increased," Li said, when delivering a government work report to the lawmakers.

The world economic recovery still faces instability and uncertainties, as macro-policy adjustments made by some countries introduce new variables, and emerging economies are facing new difficulties and challenges, he said.

Domestically, Li cited risks from public finance and banking; overcapacity, difficulties in exercising macro-controls and increasing agricultural output and rural incomes, as major challenges.

Tasks of tackling air, water and soil pollution, as well as conserving energy and reducing emissions remain arduous, Li said, adding there are major structural problems constraining employment.

Other problems include public dissatisfaction in housing, food and drug safety, medical services, old-age services, education, income distribution, land expropriation and resettlement, and public order, frequent industrial accidents and the social credibility system, he said.

Some government employees are prone to corruption and some still do not perform their duties with integrity and diligence, Li said..

"We must firmly bear in mind our duties and mission, increase our sense of vigilance against potential dangers, be eager to take on challenges, work tirelessly and effectively to solve problems, and truly live up to people' s expectations," he said.