An open-loop link adaptation adjusting method comprising: classifying, by a base station, states of a user equipment during an information transmission process according to at least one classification condition; configuring, by the base station, an open-loop link adaptation adjusting, OLLA, value for each of the classified states corresponding to the user equipment respectively; determining, by the base station, a current state of the user equipment during the information transmission process, and selecting an OLLA value corresponding to the current state of the user equipment from the OLLA values corresponding to each of the states respectively; and adjusting, by the base station, a modulation and coding scheme, MCS, value according to the OLLA value corresponding to the current state of the user equipment for sending a data packet to the user equipment, and then modifying, according to received feedback information of the data packet, the OLLA value corresponding to the current state of the user equipment for sending a data packet next time; wherein the method being characterized in that the at least one classification condition can be each of a rank of the user equipment, a layer to which the user equipment is scheduled during the transmission process, a total number of layers of the user equipment configured by the base station during the transmission process, and a preset state of the user equipment in a system, wherein, when the classification condition is the preset state of the user equipment in the system, the classifying, by the base station, the states of the user equipment during the information transmission process comprises: when the preset state is whether the user equipment is in a modulo state in a non-linear precoding communication system, dividing, by the base station, the states of the user equipment into two states wherein a current modulo indicator of the user equipment is modulo and a current modulo indicator of the user equipment is non-modulo; and when the preset state is a speed at which the user equipment moves, classifying, by the base station, the states of the user equipment during the information transmission process by presetting different speed thresholds. classifying, by a base station, states of a user equipment during an information transmission process according to at least one classification condition; configuring, by the base station, an open-loop link adaptation adjusting, OLLA, value for each of the classified states corresponding to the user equipment respectively; determining, by the base station, a current state of the user equipment during the information transmission process, and selecting an OLLA value corresponding to the current state of the user equipment from the OLLA values corresponding to each of the states respectively; and adjusting, by the base station, a modulation and coding scheme, MCS, value according to the OLLA value corresponding to the current state of the user equipment for sending a data packet to the user equipment, and then modifying, according to received feedback information of the data packet, the OLLA value corresponding to the current state of the user equipment for sending a data packet next time; when the preset state is whether the user equipment is in a modulo state in a non-linear precoding communication system, dividing, by the base station, the states of the user equipment into two states wherein a current modulo indicator of the user equipment is modulo and a current modulo indicator of the user equipment is non-modulo; and when the preset state is a speed at which the user equipment moves, classifying, by the base station, the states of the user equipment during the information transmission process by presetting different speed thresholds.