Shanghai General Motors is still reviewing the media planning and buying brief.
Burnett has been tasked with helping SGM relaunch Cadillac and strengthen its position as the leader in the luxury vehicle category.
The agency's Shanghai managing director Donald Chan said the relaunch campaign would be rooted in the strong legacy of the brand's premium image.
Burnett also plans to inject a bolder, leadership personality as Cadillac will be unveiling a new product line-up.
The win cements Burnett's hold on Cadillac, which it acquired in late 2002 following the closure of D'Arcy, its sister agency in the Publicis Groupe.
Prior to the review, SGM had done little to promote imported car brands such as Cadillac.
Chan attributed Burnett's win to the strength of its strategic and creative recommendations along with its global knowledge from sister agency, Chemistri, which is Cadillac's brand agency in the US.
Cadillac's main target is the most affluent group of customers in China - very senior executives and entrepreneurs - according to Chan, who said the marque counted BMW and Mercedes-Benz as its main competitors.
The total vehicle output in China surged year-on-year by 35 per cent to 4.4 million units in 2003. Volkswagen and General Motors emerged as the top two car-makers, with sales in excess of one million units.
China's car market is expected to see sales surge to 20 million units by 2020. Car sales have been growing at double-digits in the past three years, with supply now beginning to exceed demand. As a result, a number of players have used price reductions as their key strategy. "At this stage, the true luxury segment is still relatively under-developed. It provides an opportunity for brands like Cadillac to reshape and define the standard," said Chan.