This paper constructs a new indicators system and chooses the TOPSIS model which is improved by grey contribution degree method. Based on the China's construction industry statistical data from 2005 to 2007, the weights are quantitatively and objectively calculated by the way of calculating grey contribution degree. Based on Grey-TOPSIS evaluation model, competitiveness of China's regional construction industry is evaluated. The results show that the unbalanced phenomenon in China is seriously existed.