A method for operating an autonomous moving cleaning apparatus includes the steps of: a microcontroller unit (MCU) processes a digital signal through an encoding technique to form an encrypted encoding data set; the MCU continuously sends out the encrypted encoding data set; data values in the encrypted encoding data set are converted to high or low voltages to activate a light emission member to generate flicker light; a light receiving member continuously receives a string of reflective light corresponding to the flicker light to form a corresponding high or low voltage which is converted to a corresponding digital signal sent to the MCU to be compared with the encrypted coding data set for decoding; and the MCU controls operations of a servomotor based on decoding correctness and the detected corresponding digital signal. Thus the autonomous moving cleaning apparatus can function steadily without being interfered by external lights.