A method of transmitting machine type communication, MTC, downlink control information, DCI, being applicable to a base station, comprising: determining a DCI transmission region configured for an MTC device; generating and sending control resource configuration information to the MTC device, wherein the control resource configuration information informs the MTC device from what time/frequency region to detect the DCI belonging to the MTC device itself; determining an information detection capability of the MTC device in the DCI transmission region, wherein the information detection capability indicates whether the MTC device supports searching for DCI from a target resource region, and the target resource region is a control region of an original long term evolution, LTE, system, and the control region is comprised in spectrum resources of the original LTE system that are recultivated to 5G New Radio, NR, spectrum resources; mapping a target physical resource in the DCI transmission region according to the information detection capability and a preset resource mapping mode, wherein the target physical resource carries the DCI of the MTC device; and transmitting the DCI to the MTC device through the target physical resource mapped in the DCI transmission region, wherein the preset resource mapping mode comprises: a first mapping mode configured to map the target physical resource in a data region of the original LTE system, and a second mapping mode configured to map the target physical resource in a valid region of a subframe, wherein the valid region of the subframe is a time/frequency region excluding a cell reference signal resource in the subframe, and the valid region comprises the target resource region; wherein, in case searching for the DCI from the target resource region is not supported by at least one MTC device in the DCI transmission region, the base station maps the target physical resource in the DCI transmission region according to the first mapping mode; and, in case searching for the DCI from the target resource region is supported by all MTC devices in the DCI transmission region, the base station determines, according to requirements, whether to map the target physical resource in the DCI transmission region according to the first mapping mode or the second mapping mode. determining a DCI transmission region configured for an MTC device; generating and sending control resource configuration information to the MTC device, wherein the control resource configuration information informs the MTC device from what time/frequency region to detect the DCI belonging to the MTC device itself; determining an information detection capability of the MTC device in the DCI transmission region, wherein the information detection capability indicates whether the MTC device supports searching for DCI from a target resource region, and the target resource region is a control region of an original long term evolution, LTE, system, and the control region is comprised in spectrum resources of the original LTE system that are recultivated to 5G New Radio, NR, spectrum resources; mapping a target physical resource in the DCI transmission region according to the information detection capability and a preset resource mapping mode, wherein the target physical resource carries the DCI of the MTC device; and transmitting the DCI to the MTC device through the target physical resource mapped in the DCI transmission region, wherein the preset resource mapping mode comprises: a first mapping mode configured to map the target physical resource in a data region of the original LTE system, and a second mapping mode configured to map the target physical resource in a valid region of a subframe, wherein the valid region of the subframe is a time/frequency region excluding a cell reference signal resource in the subframe, and the valid region comprises the target resource region; wherein, in case searching for the DCI from the target resource region is not supported by at least one MTC device in the DCI transmission region, the base station maps the target physical resource in the DCI transmission region according to the first mapping mode; and, in case searching for the DCI from the target resource region is supported by all MTC devices in the DCI transmission region, the base station determines, according to requirements, whether to map the target physical resource in the DCI transmission region according to the first mapping mode or the second mapping mode. a first mapping mode configured to map the target physical resource in a data region of the original LTE system, and a second mapping mode configured to map the target physical resource in a valid region of a subframe, wherein the valid region of the subframe is a time/frequency region excluding a cell reference signal resource in the subframe, and the valid region comprises the target resource region; wherein, in case searching for the DCI from the target resource region is not supported by at least one MTC device in the DCI transmission region, the base station maps the target physical resource in the DCI transmission region according to the first mapping mode; and, in case searching for the DCI from the target resource region is supported by all MTC devices in the DCI transmission region, the base station determines, according to requirements, whether to map the target physical resource in the DCI transmission region according to the first mapping mode or the second mapping mode.