A method of dealing with business conflict of a dual-card-dual-standby mobile phone includes the steps as follows. Calculate the period of the periodic location update of the main card and subordinate card respectively, and reset a new period of the periodic location update. Comparing to the original period of the periodic location update, the new period of the periodic location update is reduced by twice of a time for the mobile phone to do the location update. Thus, when the first location update is delayed due to the terminating call, it still has time for the second location update. Set priority level for each conflicting services, so as to avoid the service conflict, such as the conflict between the originating and terminating call and the location update, and the conflict between the location update of main card and subordinate card.