A data access method and a related apparatus and system, where the data access method includes receiving, by a non-volatile memory express (NVMe) from a processor, a first key-value command whose format meets an NVMe interface standard, where the first key-value command carries a first operation manner indicator and a first operation object type indicator, and an operation object type indicated by the first operation object type indicator includes a value, obtaining, by the NVMe, N keys corresponding to the first key-value command, and performing, by the NVMe on a value corresponding to each of the N keys, an operation indicated by the first operation manner indicator. Hence, the data access method is helpful in promoting a data access manner in an NVMe technology.