China's ongoing import expo has attracted active participation by enterprises from the world's least developed countries, an official said Friday.

Over 170 firms from 40 least developed countries including Bangladesh, Madagascar, Rwanda and Zambia are attending the second China International Import Expo (CIIE), Liu Fuxue, vice director of the CIIE bureau, told a press conference.

The CIIE, lasting from Nov. 5 to Nov. 10, has attracted the participation of nearly 3,900 companies from 155 countries and regions.