A　simulation　of　pedestrian　evacuation　in　room　with　affected　visual　field　and　absence　of　the　direction　of　evacuation　signs　will　be　presented　based　on　cellular　automata　(CA)　in　this　paper.　Evacuation　room　is　divided　into　exit-visible　area　and　exit-invisible　area　by　pedestrian　visual　field　radius.　Two　basic　dynamic　parameters　in　Dynamic　Parameters　Model　(DPM)　are　used　to　simulate　the　varied　movement　characteristics　of　pedestrian　in　different　evacuation　areas　including　normal　evacuation　movement　and　blind　random　movement.　The　effect　of　pedestrian　visual　field　radius　on　evacuation　time　is　studied　without　evacuation　signs　on　wall.　It　is　observed　that　evacuation　time　is　dependent　not　only　on　the　pedestrian　visual　field　radius　but　also　on　the　initial　density.　It　is　also　found　that　the　evacuation　time　will　tend　to　the　level　and　remain　unchanged　with　visual　field　radius　rising.　©　2010　IEEE.