Abstract: To investigate the effect of SST anomalies on the characters of low-frequency oscillation(LFO), two sets of numerical experiment have been performed with the 2-layer OSUGCM. One uses monthly climatic data of SST and the other includs two tests in which the artificial centers of SST anomalies(ΔSST) are assumed in the eastern and the middle of tropical eastern Pacific, respectively. The results of these experiments show that: (1) The SST anomalies in tropical eastern Pacific can modify the distribution of LFO variance. When the positive center of ΔSST is at the middle of tropical eastern Pacific, the value of LFO variance center in tropical eastern Pacific is larger than that in tropical western Pacific and tropical India Ocean. The contrast is true, when the positive center of ΔSST is in the eastem part of tropical eastern Pacific. (2) The response of propagation characters of LFO to the geographic location of ΔSST center is sensitive considerably, that is, the propagation direction and phase velocity of LFO in the two sensitive tests are different considerably.