A random access method, a communications apparatus, a chip, and a storage medium are described. A terminal device receives a first synchronization signal/PBCH block (SSB) on a first candidate SSB occasion. The first candidate SSB occasion is associated with a first random access channel time-frequency-code resource, and the terminal device sends random access information on the first random access channel time-frequency-code resource. The first candidate SSB occasion is included in L candidate SSB occasions. The L candidate SSB occasions are periodically and sequentially associated with random access channel time-frequency-code resources. By using M adjacent candidate SSB occasions as a mapping periodicity, M is less than L.