Simulation　of　pedestrian　evacuation　flow　with　affected　visual　field　is　carried　out　on　the　basis　of　cellular　automata.　The　room　to　be　evacuated　is　divided　into　exit　visible　area,　wall　visible　area　and　blind　area　by　pedestrian　sight　radius,　and　two　basic　dynamic　parameters　in　the　dynamic　parameters　model　are　used　to　simulate　the　varied　movement　characteristics　of　pedestrian　in　different　evacuation　areas,　including　normal　evacuation　movement,　movement　along　the　wall　and　movement　in　fixed　direction.　The　effect　of　pedestrian　sight　radius　on　evacuation　time　is　studied　with　evacuation　signs　on　the　wall　and　pedestrian　stochastically　moving　to　find　the　wall　in　fixed　directions　and　then　moving　along　the　wall.　It　is　observed　that　the　evacuation　time　depends　not　only　on　the　pedestrian　sight　radius　but　also　on　the　length　and　utilization　rate　of　exit.