A method for transmitting data, wherein the method comprising: transmitting, by a station STA, characterizing information to a radio access point AP, wherein the characterizing information is used to characterize a maximum transmission delay allowed by the uplink data to be transmitted by the STA, wherein the characterizing information is an emergency identifier that identifies the uplink data to be transmitted by the STA as emergency data which is to be transmitted by the STA within the maximum transmission delay, and the emergency identifier is an identifier which corresponds to the maximum transmission delay allowed by the emergency data on the STA, for the AP to determine the maximum transmission delay allowed by the uplink data to be transmitted by the STA according to the emergency identifier; receiving, by the STA, a transmission time that is specified for the STA and returned by the AP within the maximum transmission delay allowed by the uplink data to be transmitted by the STA, wherein the transmission time is within a range of the maximum transmission delay allowed by the uplink data to be transmitted by the STA; and transmitting, by the STA, the uplink data to the AP within the transmission time; further wherein, before the transmitting, by the station STA, the characterizing information to the AP, the method further comprises: transmitting, by the STA, the maximum transmission delay which is allowed by the uplink data to be transmitted by the STA and which corresponds to the emergency identifier to the AP, so that the AP determines the maximum transmission delay allowed by the uplink data to be transmitted by the STA according to the emergency identifier. transmitting, by a station STA, characterizing information to a radio access point AP, wherein the characterizing information is used to characterize a maximum transmission delay allowed by the uplink data to be transmitted by the STA, wherein the characterizing information is an emergency identifier that identifies the uplink data to be transmitted by the STA as emergency data which is to be transmitted by the STA within the maximum transmission delay, and the emergency identifier is an identifier which corresponds to the maximum transmission delay allowed by the emergency data on the STA, for the AP to determine the maximum transmission delay allowed by the uplink data to be transmitted by the STA according to the emergency identifier; receiving, by the STA, a transmission time that is specified for the STA and returned by the AP within the maximum transmission delay allowed by the uplink data to be transmitted by the STA, wherein the transmission time is within a range of the maximum transmission delay allowed by the uplink data to be transmitted by the STA; and transmitting, by the STA, the uplink data to the AP within the transmission time; further wherein, before the transmitting, by the station STA, the characterizing information to the AP, the method further comprises: transmitting, by the STA, the maximum transmission delay which is allowed by the uplink data to be transmitted by the STA and which corresponds to the emergency identifier to the AP, so that the AP determines the maximum transmission delay allowed by the uplink data to be transmitted by the STA according to the emergency identifier.