The standard curves of two compounds were linear well. The average recovery of TMP was(101.2)%,RSD=0.4%(n=4). The average recovery of SMZ was 100.6%,RSD=0.7(n=4).

• 复方磺胺甲?f唑中甲氧苄啶和磺胺甲?f唑分别在0.；1~0