A method and an apparatus are provided for HARQ-ACK feedback information transmission in a traffic adaptive TDD system. The method includes receiving, by a User Equipment (UE), a System Information Block (SIB); obtaining, by the UE, a TDD uplink and downlink configuration that is indicated by current system information and does not support traffic adaptive UE, from the SIB; identifying, by the UE, implicit resources of Physical Uplink Control Channel (PUCCH) based on the TDD uplink and downlink configuration; obtaining, by the UE, a HARQ-ACK timing that supports a traffic adaptive UE; and transmitting, by the UE, the HARQ-ACK feedback information on determined PUCCH resources using a determined PUCCH format, based on the obtained HARQ-ACK timing.