Abstract: For problems that data stored in EEPROM of embedded microcontroller system would loss or change because of interference, the paper analyzes causes of loss or damage of stored data in EEPROM, and proposed a software redundant method for improving reliability of data storage of EEPROM. The method uses partition storage and CRC checksum technology to reduce possibility of collapse of the whole data in a given time, which improves recovery ability of EEPROM after stored data was partly damaged. The application showed the method can effectively improve reliability of data storage of EEPROM.