A method for reporting power reduction information, comprising: sending, by a terminal device, a first media access control control element, MAC CE, to a network device, wherein the first MAC CE comprises power management-maximum power reduction, P-MPR, information of at least one carrier, wherein the first MAC CE is a power headroom report, PHR, MAC CE, and the PHR MAC CE comprises power information of one or more carriers, wherein the power information comprises: first information, used for indicating whether the P-MPR is applied to the terminal device; second information, used for indicating whether a PHR is calculated based on actual transmission or a reference format; and third information, which is a PHR, wherein when the first information indicates that the P-MPR is applied to the terminal device, if the second information indicates that the PHR is calculated based on the actual transmission, the power information further comprises fourth information and fifth information, wherein the fourth information is used for indicating a maximum transmit power of the terminal device; and the fifth information is used for indicating a P-MPR reporting range, characterized in that a starting P-MPR of P-MPR reporting range corresponding to P-MPR reporting index with a value of 0 is not 0. sending, by a terminal device, a first media access control control element, MAC CE, to a network device, wherein the first MAC CE comprises power management-maximum power reduction, P-MPR, information of at least one carrier, wherein the first MAC CE is a power headroom report, PHR, MAC CE, and the PHR MAC CE comprises power information of one or more carriers, wherein the power information comprises: first information, used for indicating whether the P-MPR is applied to the terminal device; second information, used for indicating whether a PHR is calculated based on actual transmission or a reference format; and third information, which is a PHR, wherein when the first information indicates that the P-MPR is applied to the terminal device, if the second information indicates that the PHR is calculated based on the actual transmission, the power information further comprises fourth information and fifth information, wherein the fourth information is used for indicating a maximum transmit power of the terminal device; and the fifth information is used for indicating a P-MPR reporting range, characterized in that a starting P-MPR of P-MPR reporting range corresponding to P-MPR reporting index with a value of 0 is not 0. first information, used for indicating whether the P-MPR is applied to the terminal device; second information, used for indicating whether a PHR is calculated based on actual transmission or a reference format; and third information, which is a PHR, wherein when the first information indicates that the P-MPR is applied to the terminal device, if the second information indicates that the PHR is calculated based on the actual transmission, the power information further comprises fourth information and fifth information, wherein the fourth information is used for indicating a maximum transmit power of the terminal device; and the fifth information is used for indicating a P-MPR reporting range, characterized in that a starting P-MPR of P-MPR reporting range corresponding to P-MPR reporting index with a value of 0 is not 0.