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Recently, observations and simulations have shown that Arctic stratospheric ozone (ASO) variations affect the middle-high latitude tropospheric climate in the Northern Hemisphere. In particular, a connection from the ASO to El Nino-Southern Oscillation (ENSO) has been reported. However, no detailed study has been made of a key process in the connection, the influence of ASO on the North Pacific sea surface temperature (SST) and its underlying mechanism. Using observations, reanalysis and simulations, it is found that the ASO changes in March have the strongest connection with North Pacific SST variations in April. This implies a leading effect of ASO on North Pacific SST. The stratospheric circulation anomalies caused by March ASO changes can rapidly extend to the lower troposphere in the region 60 degrees-90 degrees N, 180 degrees-120 degrees W. Nevertheless, a theoretical analysis indicates that circulation anomalies from the region 60 degrees-90 degrees N, 180 degrees-120 degrees Win the lower troposphere would take about a month to propagate horizontally to the North Pacific middle latitudes (30 degrees-60 degrees N, 180 degrees-120 degrees W).