In order to achieve CO_2 emission reduction targets and solve Chinese enterprises' poor performance on response to climate change, decision-making model of low-carbon technology adoption is built based on evolutionary game theory, and stable strategies are analyzed. Theoretical study and numerical simulation show that enterprise groups will evolve to an "ideal state" of all adoption only when they can obtain excess returns by low-carbon technology adoption. Otherwise, enterprises do not choose low-carbon technology adoption. In this case, subsidy policies such as investment of low-carbon technology and carbon reduction should be implemented to guide evolution into the "ideal state", but the subsidies should be controlled in certain ranges to maximize their incentive effect.