Using a new kind of absorbent which is the mixture of aqueous ammonia and ethanol, a process of carbon capture by ammonia of low concentration with reinforced crystallization and lower energy consumption is presented. By the application of antisolvent crystallization to reinforce crystallization process, low energy consumption of regeneration could be achieved easily due to saving the energy to heat the water of carbonized ammonia in the desorption process. TGA is adopted to study the regeneration process of crystal product, and heating method pyrolysis and constant temperature pyrolysis are used respectively. What's more, if the waste heat from the power plant can be used as heat source of the regeneration process, the more energy can be saved for the technology. With the regeneration temperature between 40 ℃and 80 ℃, the active energy can be as low as 48.38 kJ/mol. The regeneration process is studied at the constant temperature of 60 ℃, 80 ℃ and 100 ℃. And if the rate of rising temperature is 5 K/min, the crystal product will be totally decomposed when the temperature reaches 80℃, not only can achieve low energy consumption but also have fast regeneration rate which have the advantage over the process of rich carbonated ammonia. For the mixed absorbent, the different proportion of the dissolved agent has little effect on the regeneration process, and the composition of the mixture is determined only by the absorption rate. The better regeneration rate can be obtained by the constant temperature of 80 ℃. After the calculation of 16 classical models, the model function was selected for the study of crystal products.