A negotiation method for an enhanced operating mode, applied to an initiator for operating mode negotiation and comprising: sending, by an initiator, an operating mode indication OMI to a responder, wherein the OMI comprises a channel width indication information and a space-time stream number indication information, wherein a capability range of a channel width indicated by the channel width indication information is greater than 160 MHz, and a capability range of the number of space-time streams indicated by the space-time stream number indication information is greater than 8, wherein the OMI is carried in control information corresponding to a control subfield, and the control information comprises at least either of the channel width indication information and the space-time stream number indication information, wherein the control subfield comprises a first control subfield and a second control subfield, and the first control subfield is an OMI basic indication subfield, and the second control subfield is an OMI extension indication subfield; and the first control subfield and the second control subfield jointly indicate an enhanced OMI; and performing, by the initiator, transmission with the responder. sending, by an initiator, an operating mode indication OMI to a responder, wherein the OMI comprises a channel width indication information and a space-time stream number indication information, wherein a capability range of a channel width indicated by the channel width indication information is greater than 160 MHz, and a capability range of the number of space-time streams indicated by the space-time stream number indication information is greater than 8, wherein the OMI is carried in control information corresponding to a control subfield, and the control information comprises at least either of the channel width indication information and the space-time stream number indication information, wherein the control subfield comprises a first control subfield and a second control subfield, and the first control subfield is an OMI basic indication subfield, and the second control subfield is an OMI extension indication subfield; and the first control subfield and the second control subfield jointly indicate an enhanced OMI; and wherein the OMI comprises a channel width indication information and a space-time stream number indication information, wherein a capability range of a channel width indicated by the channel width indication information is greater than 160 MHz, and a capability range of the number of space-time streams indicated by the space-time stream number indication information is greater than 8, wherein the OMI is carried in control information corresponding to a control subfield, and the control information comprises at least either of the channel width indication information and the space-time stream number indication information, wherein the control subfield comprises a first control subfield and a second control subfield, and the first control subfield is an OMI basic indication subfield, and the second control subfield is an OMI extension indication subfield; and the first control subfield and the second control subfield jointly indicate an enhanced OMI; and performing, by the initiator, transmission with the responder.