Development of low-carbon economy is an important approach to adjust industrial structure. With the gradual acceptance of low-carbon economic concept, borders of industries gradually become unclear and construction industry steps into the phase of combination. This paper gains the result that the profit of implementing low carbon technology is increasing function or decreasing function to the actual value and by adopting efficient low carbon technology in construction industry in two different fusing stages, and considering the market competition situation through the return condition of referral encouragement. It also gains the situation that the government provides referral encouragement or does not provide referral encouragement by analyzing the relationship between the profits and the average benefits of low carbon in the market, and finally proposes the fusing countermeasures of construction industry in the low carbon economy age. And it gave the accelerate in-depth development of modern construction industry.