a method and a system for distributing a mobile broadcast service are provided . the method includes : adding header information into broadcast service contents , the header information comprising integrality information and version information of a service packet containing the broadcast service contents ; distributing the service packet to a user terminal ; updating or accepting , by the user terminal , its own service data by use of the service packet in accordance with the integrality information and version information of the service packet . the method and the system according to the embodiments in the present invention may bring about higher transmission efficiency of data packet .