Disclosed in a mobile communication system, and more particularly a method of re-transmitting data through a reverse link in a packet data system using ARQ (automatic repeat request) and a packet transmitting method and apparatus by which transmission efficiency is enhanced. The present invention discloses a method for re-transmitting data through a reverse link in Packet Data communication system using automatic repeat request (ARQ) adjusting data retransmission energy to be reduced at a predetermined ratio of one receiving energy for an initial data transmission to other receiving energy for a data re-transmission. The present invention also discloses a hybrid automatic repeat request system for packet transmission in which separate traffic-to-pilot power ratios are assigned to sub-packets when transmitting the sub-packets formed from one packet.