Taken　examples　of　recent　major　disasters,　the　deficiencies　of　shelter　and　evacuation　system　in　planning,　construction,　etc..　and　the　inadaptability　of　protecting　security　needs　of　the　city　under　extreme　disasters　is　analyzed.　Given　this,　on　the　basis　of　the　analysis　of　the　connotation　of　catastrophic　environment　and　adaptation　and　the　relationship　between　them,　the　concept　of　adaptive　planning　of　urban　shelter　and　evacuation　system　under　the　disastrous　environment　is　proposed.　Based　on　dynamic　planning　idea,　the　adaptive　planning　is　preliminarily　discussed　in　the　three　perspectives　of　disaster　prevention　functions,　fortification　level,　hierarchical　structures　and　spatial　characteristics　and　some　planning　strategies　and　measures　coping　with　catastrophes　are　given.