An uplink service transmission method, wherein the method is applied to an orthogonal frequency division multiple access OFDMA system and the method comprises: dividing, by a wireless local area network access point according to a quantity of stations that are connected to the access point, an entire channel on which the access point is located into multiple resource blocks; allocating, by the access point to each of the stations according to channel estimation information of the stations, a resource block for transmitting uplink information; and separately sending, by the access point, channel allocation indication information to each of the stations, wherein the channel allocation indication information is used to indicate information about the resource block allocated to each of the stations; characterised by: the dividing, by a wireless local area network access point according to a quantity of stations that are connected to the access point, an entire channel on which the access point is located into multiple resource blocks comprises: determining (Sill), by the access point according to the quantity of the stations, a quantity of the resource blocks on the entire channel on which the access point is located; evenly allocating, by the access point, data subcarriers to each of the resource blocks according to the quantity of the resource blocks and a quantity of the data subcarriers on the entire channel on which the access point is located, wherein a quantity of data subcarriers in 256 subcarriers comprised in a 20-MHz channel on which the access point is located comprises 192, 208, or another preset quantity; and allocating, by the access point, a pilot to each of the resource blocks, wherein there are at least 12 data subcarriers between two adjacent pilots. dividing, by a wireless local area network access point according to a quantity of stations that are connected to the access point, an entire channel on which the access point is located into multiple resource blocks; allocating, by the access point to each of the stations according to channel estimation information of the stations, a resource block for transmitting uplink information; and separately sending, by the access point, channel allocation indication information to each of the stations, wherein the channel allocation indication information is used to indicate information about the resource block allocated to each of the stations; characterised by: the dividing, by a wireless local area network access point according to a quantity of stations that are connected to the access point, an entire channel on which the access point is located into multiple resource blocks comprises: determining (Sill), by the access point according to the quantity of the stations, a quantity of the resource blocks on the entire channel on which the access point is located; evenly allocating, by the access point, data subcarriers to each of the resource blocks according to the quantity of the resource blocks and a quantity of the data subcarriers on the entire channel on which the access point is located, wherein a quantity of data subcarriers in 256 subcarriers comprised in a 20-MHz channel on which the access point is located comprises 192, 208, or another preset quantity; and allocating, by the access point, a pilot to each of the resource blocks, wherein there are at least 12 data subcarriers between two adjacent pilots. determining (Sill), by the access point according to the quantity of the stations, a quantity of the resource blocks on the entire channel on which the access point is located; evenly allocating, by the access point, data subcarriers to each of the resource blocks according to the quantity of the resource blocks and a quantity of the data subcarriers on the entire channel on which the access point is located, wherein a quantity of data subcarriers in 256 subcarriers comprised in a 20-MHz channel on which the access point is located comprises 192, 208, or another preset quantity; and allocating, by the access point, a pilot to each of the resource blocks, wherein there are at least 12 data subcarriers between two adjacent pilots.