A method of improving Hybrid Automatic Repeat Request operation for a user equipment operating in HS-SCCH less operation in a wireless communications system includes receiving a retransmission data in an HARQ procedure, determining a decoding result of data stored in a first soft buffer, combining the retransmission data with the data stored in the first soft buffer for generating a combined data when the UE determines that the data stored in the first soft buffer has not been successfully decoded, and performing a decoding process on the combined data and a store process corresponding to a second soft buffer. The first soft buffer is obtained by a first rule and the second soft buffer is obtained by a second rule.