For the demand of low power and long standby in modern satellite navigation receiver and OEM board, a new technology of second carrier discard tracking for satellite navigation base-band is presented in this paper. Firstly, the original mid-frequency was discarded, and then the remaining carriers are tracked. The technology can greatly reduced the rate and sum of the base-band data. On FPGA realization, one tracking channel can track 16 satellites at the same time. The experimental result proves that the second carrier discard tracking technology can save 30% resources compare with the traditional tracking technology, it can achieve the following performance index: tracking sensitivity to 139dBm, the measure precision of pseudo-range to 0.5m, the precision of carrier phase to 0.01m.