The embodiments of the present disclosure provide a method, an apparatus and a system for acquiring system information. The method for acquiring includes setting at least two indicators for indicating a system information update, the at least two indicators being corresponding to at least two User Equipments (UEs); and sending the indicators to the UEs, so that the UEs acquire system information according to their respective modification periods. Through the embodiments of the present disclosure, for example the MTC UE can acquire the latest system information in time, while ensuring that any extra and unnecessary acquisition of system information is not performed to reduce the power consumption of the MTC UE.