This　paper　uses　the　relation　of　the　cosmic　scale　factor　and　scalar　held　to　solve　Wheeler-De　Witt　equation,　gives　the　tunnel　effect　of　the　cosmic　scale　factor　a　and　quantum　potential　well　of　scalar　held,　and　makes　it　fit　with　the　physics　of　cosmic　quantum　birth.　By　solving　Wheeler-De　Witt　equation　we　achieve　a　general　probability　distribution　of　the　cosmic　birth,　and　give　the　analysis　of　cosmic　quantum　birth.