Abstract: New technology for preparation K_2CO_3 with mixed amine of high boiling point as extractant and an organic solvent as diluent has been developed.The effects of time, temperature and pressure on carbonizing reaction have been researched. Effect of time and pressure has been proved by an industrial simulated apparatus. A new method of regeneration of amine with ammonia at ordinary temperature has been developed. The purity of by-product NH_4Cl is above 99%. This new technology has high utilization of potassium and low consumption of energy and amine.