Soda ash, as one of the most important chemicals, is mainly manufactured by the Solvay process. However, the Solvay process consumes energy at a rate of up to 9.7-13.6 GJ/ton Na2CO3. Here, we present an energy saving method to produce soda ash in a proton cycled membrane electrolysis (PCME) process. After forming H+ and OH- at the anode and cathode in electrolysis process, respectively. The H+-containing solution is used to react with CaCO3 to obtain pure CO2 which is absorbed by the OH--containing catholyte to generate soda ash with a purity of 99.2%. Our experiments found that the voltage required for PCME was 0.538-0.765 V at 10 mA/cm(2), and the average current efficiency was up to 93.7%. Therefore, the energy consumption in soda ash production can be reduced to 5.32 GJ/ton soda ash, a decrease of about 60.9% compared with the Solvay process.