The　conversion　ratio　between　kinetic　energy　and　internal　energy　is　analyzed.　The　change　of　surface　energy　density　of　first　debris　cloud　with　projectile　velocity　is　then　analyzed　based　on　dual　peak　structure　in　the　limit　curve,　and　the　possibility　of　the　existence　of　initiation　blind　zone　when　the　double-shell　casing　is　shocked　by　hypervelocity　debris　is　presented　in　theory.　The　non-linear　dynamics　software　AUTODYN　is　used　to　simulate　the　shock　initiation　of　composition　B　charge　in　double-shell　casing　impacted　by　hypervelocity　tungsten　projectile.　The　simulation　result　shows　that　the　blind　zone　exists.　This　conclusion　is　very　important　to　guide　the　warhead　shell　structure　design　and　security　analysis.