The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for processing system information for Machine-Type Communication system, the method comprising: receiving repetitions of system information for scheduling other SIBs in a first period; receiving an indicator indicating the system information for scheduling other SIBs is not changed in a second period followed by the first period in a specific time of the first period; and processing the system information for scheduling other SIBs based on the repetitions of the system information accumulated from the specific time of the first period if the system information for scheduling other SIBs is not successfully decoded at the time of end of the first period.