A WLAN system resource indication method, comprising: generating, by an access point, a trigger frame that carries resource indication information; and sending, by the access point to multiple stations, the trigger frame that carries the resource indication information, wherein the resource indication information comprises multiple pieces of sub resource indication information, each piece of the sub resource indication information comprises: an identifier of one of the multiple stations, frequency domain resource allocation information of the one station and spatial stream information of the one station, which spatial stream information indicates a spatial stream allocated to the one station; wherein the frequency domain resource allocation information comprises one index, and the index indicates a size and a location of one frequency domain resource unit RU in a bandwidth of the WLAN system; for different bandwidths of the WLAN system, the index is one of multiple indexes in the following: indexes "0-36", each of which indicates a RU of 26 tones allocated to the one station; indexes "37-52", each of which indicates a RU of 52 tones allocated to the one station; indexes "53-60", each of which indicates a RU of 106 tones allocated to the one station; indexes "61-64", each of which indicates a RU of 242 tones allocated to the one station; indexes "65-66", each of which indicates a RU of 484 tones allocated to the one station; indexes "67", which indicates a RU of 996 tones allocated to the one station; indexes "68-127", each of which reserved. generating, by an access point, a trigger frame that carries resource indication information; and sending, by the access point to multiple stations, the trigger frame that carries the resource indication information, wherein the resource indication information comprises multiple pieces of sub resource indication information, each piece of the sub resource indication information comprises: an identifier of one of the multiple stations, frequency domain resource allocation information of the one station and spatial stream information of the one station, which spatial stream information indicates a spatial stream allocated to the one station; wherein the frequency domain resource allocation information comprises one index, and the index indicates a size and a location of one frequency domain resource unit RU in a bandwidth of the WLAN system; for different bandwidths of the WLAN system, the index is one of multiple indexes in the following: indexes "0-36", each of which indicates a RU of 26 tones allocated to the one station; indexes "37-52", each of which indicates a RU of 52 tones allocated to the one station; indexes "53-60", each of which indicates a RU of 106 tones allocated to the one station; indexes "61-64", each of which indicates a RU of 242 tones allocated to the one station; indexes "65-66", each of which indicates a RU of 484 tones allocated to the one station; indexes "67", which indicates a RU of 996 tones allocated to the one station; indexes "68-127", each of which reserved. an identifier of one of the multiple stations, frequency domain resource allocation information of the one station and spatial stream information of the one station, which spatial stream information indicates a spatial stream allocated to the one station; wherein the frequency domain resource allocation information comprises one index, and the index indicates a size and a location of one frequency domain resource unit RU in a bandwidth of the WLAN system; for different bandwidths of the WLAN system, the index is one of multiple indexes in the following: indexes "0-36", each of which indicates a RU of 26 tones allocated to the one station; indexes "37-52", each of which indicates a RU of 52 tones allocated to the one station; indexes "53-60", each of which indicates a RU of 106 tones allocated to the one station; indexes "61-64", each of which indicates a RU of 242 tones allocated to the one station; indexes "65-66", each of which indicates a RU of 484 tones allocated to the one station; indexes "67", which indicates a RU of 996 tones allocated to the one station; indexes "68-127", each of which reserved. indexes "0-36", each of which indicates a RU of 26 tones allocated to the one station; indexes "37-52", each of which indicates a RU of 52 tones allocated to the one station; indexes "53-60", each of which indicates a RU of 106 tones allocated to the one station; indexes "61-64", each of which indicates a RU of 242 tones allocated to the one station; indexes "65-66", each of which indicates a RU of 484 tones allocated to the one station; indexes "67", which indicates a RU of 996 tones allocated to the one station; indexes "68-127", each of which reserved.