The invention provides a quick dialing method. The method includes the steps of (a) starting an instant messaging application program and starting a conversation window of a contact person in the instant messaging application program, (b) responding to calling input of a user to generate a calling signal, (c) responding to the calling signal, judging whether the contact person of the current conversation window in the instant messaging application program has a related telephone number, finishing is carried out if no and carrying out the step (c) if yes, (d) reading the related telephone number of the contact person of the current conversation window, and (e) starting a dialing program according to the read telephone number to carry out dialing. The electronic device with the quick dialing function and the quick dialing method are aimed in that the user and the contact person can directly dial the related telephone number of the contact person according to information in the instant messaging application program in the process that communication is carried out through the instant messaging application program so that talking connection can be built.