Chinese is facing the huge pressure of carbon emission reduction. The index system of low carbon economy including international R D capital technology spillover index is constructed to evaluate the low carbon economy development level of 30 provinces in China in 2012. The projection pursuit classification model is used to calculate the best projection direction to show the important indexes of low carbon economy. At the same time, the projection values of each area are calculated for cluster analysis. The final results show that the international R D capital technology spillover is an important factor influencing the development of low carbon economy in China, and the levels of the economy development of the low-carbon are different in different province. At last, the corresponding suggestions are proposed.