The sixth Northeast Asia Investment and Trade Expo began Thursday in Changchun, capital of northeast China's Jilin Province.

It attracted 50,000 businessmen from home and abroad, including those from 110 of the world's top 500 enterprises.

The expo will be held from September 2 to 6.

On the sidelines of the expo, a series of economic cooperation forums will be held.

The expo was first held in 2005.