In　order　to　solve　existent　questions　of　CAI　(Computer　Aided　Instruction)　in　university　teaching,　the　course　of　Elements　of　Information　Theory　was　taken　as　an　example　to　describe　how　to　use　the　CAI.　According　to　characteristic　of　this　course　and　teaching　law,　CAI　could　be　used　correctly　and　reasonably　by　some　methods　which　could　wake　up　the　interest　of　students,　such　as　the　combination　between　writing　on　the　blackboard　and　electronic　blackboard　writing,　color　matching,　the　combination　between　dynamic　state　and　static　state,　the　presented　amount　of　information　and　the　control　of　speed,　the　interaction　between　teachers　and　students,　the　diversity　of　CAI　and　so　on.　The　practice　shows　that　the　proposed　teaching　method　based　on　CAI　contributes　to　play　the　leading　role　of　teachers　and　the　subject　status　of　students.　The　learning　initiative　of　college　students　could　be　inspired　and　their　learning　interest　could　also　be　aroused　by　CAI.　Finally,　the　quality　and　efficiency　of　classroom　teaching　are　further　improved.