Abstract: An Integrated Circuit (IC) of an electronic thermometer includes resistors and capacitors combination, logic switch system or formulated compensation parameter table being established therein for calibration of preset objective value of software and hardware utilized by the system to select optimum compensated resistors and capacitors arranged combination or the optimum parameter group within the compensation parameter table, the selected combination being written into the internal established or externally mounted EEPROM or Memory such that the internally established programs in the IC accesses the resistors and capacitors combination or the compensated parameters.