Abstract: The present invention provides an electronic cigarette includes a power supply, a micro-controller and a heater for heating and producing smoke, which are orderly and electrically connected to constitute a loop; further includes at least two airflow sensors electrically connected to the micro-controller for sensing the airflow in the electronic cigarette and outputting sensed signal, the micro-controller conducts the loop according to sensed signal. The electronic cigarette and its circuit utilize at least two airflow sensors electrically connected to the micro-controller and sensing the airflow in the electronic cigarette and outputting sensed signal such that the micro-controller conducts the loop according to the sensed signal to achieve exponentially reducing malfunction rate of electronic cigarettes as a result of the airflow sensor failure. The electronic cigarette reduces the quality risks of electronic cigarette.