You sent me a PM, too; I hope you won't mind if I quote it here:
i unzip all the files of .zip file include gov.sandia.jess.debug_7.0.0 and so on.but which is the top level of derectory.i hava set up it in the d:\eclipse\eclipse\(configures,figures,plugins,readme....)which place i should put them in.
When it's installed, an eclipse plugin takes the form of a subdirectory of (in your case) d:\eclipse\eclipse\plugins. So if you look in this directory, you will find subdirectories of plugins called, for example, something like org.eclipse.ui_3.0.1, org.eclipse.core.runtime_3.0.1, etc. You need to install the JessDE so that you end up with directories named d:\eclipse\eclipse\plugins\gov.sandia.jess_7.0.0,
d:\eclipse\eclipse\plugins\gov.sandia.jess.editor_7.0.0, d:\eclipse\eclipse\plugins\gov.sandia.jess.debug_7.0.0, etc.
Then, after restarting Eclipse,
you should find that *.clp files open in the Jess editor, which has the little Jess silver-ball icon.