China will further expand opening-up this year in alignment with high-standard international trade rules, and will open its door wider to the world with better business environment and services, Premier Li Qiang said Monday.

Opening-up is China's basic state policy and the country will keep promoting it irrespective of changes in the external environment, Li said.

Noting that this year marks the 45th anniversary of the start of the reform and opening-up policies in China, the advent of which impacted not only China but the whole world, Li said most foreign companies are optimistic about development prospects in China.