A system and method of controlling charging process of an electronic device. The electronic device is installed with a battery and a protection circuit. The method includes setting a time interval to check a charging state of the electronic device, checking whether the battery is in an error state before a power supply charges the electronic device, and checking whether the electronic device is in an charging error state according to the time interval till the electronic device completes the charging process. When there is an abnormity, the method can output a message to a user and end the charging process using the protection circuit.