The solar wind data observed by ACE satellite during 1997--2004 and the corresponding Dst indices are used to analyze the correlations of the interplanetary parameters (Bz,Ey,v,Pk,|B|,ε'=vxB2zsin4(θ/2)) with the Dst indices, focusing on the magnetic storms of different intensities. The results show that Ey and Bzcorrelate well with Dst index. It is found that the larger the storm intensity is, the better the correlative relationship between interplanetary parameters and Dst indices is. As for moderate storms (-100nT〈 Dstmin≤ -50nT), there is a low correlative relationship between interplanetary parameters and Dst indices. When dividing storms into two levels, that is -150 nT〈 Dstmin ≤ -50 nT and Dstmin ≤ -150 nT, there is a best correlative relationship between cr and Dst. As a single factor, Ey correlate best with Dst, and the inferior one is Bz.