General Motors Corp. will unveil a new pair of concept carsin its Chevrolet and Buick lines at this month's Shanghai Auto Show, GM Chinasaid Monday.

The cars will be among 40 vehicles the company and its Chinese joint venturepartners plan to display as GM increasingly looks to China to offset sluggish sales andcrippling legacy costs elsewhere.

GM said the concept cars include the latest version of the Chevrolet Volt,the company's extended-range electric passenger vehicle which was introduced inJanuary at the North American International Auto Show in Detroit.

It said the Buick model was developed at GM's design and engineering centerin Shanghai andwould point to "possible future directions for the brand worldwide."

GM opened its first factory in China in 1998 and now operatesseven joint ventures and two wholly owned foreign enterprises in the country.Along with five vehicle factories and one engine plant, the company has alsolaunched an auto financing venture and a chain of dealerships.

Its China sales last yearrose 32 percent to 876,747 vehicles, with joint venture Shanghai General MotorsCorp. becoming China'stop-selling domestic automaker with 365,400 vehicles sold.

GM said it also plans to display minivans and compact cars produced by itsSAIC-GM-Wuling joint venture set up in 2005. Wuling's vehicles have become amainstay of the company's Chinabusiness, accounting for more than half of GM's total sales in China lastyear.

GM said models from the company's German Opel brand, Buick, Cadillac,Chevrolet and Saab will also be featured at the show, which runs April 22-28.