Flow　visualization　was　performed　on　a　1/4　scale　model　of　pressurizer　and　several　different　types　of　flow　are　investigated　in　the　down　head　area　of　the　model.　Local　convective　heat　transfer　coefficient　was　investigated　on　a　1/5　scale　model　of　pressurizer.　The　experiment　interface　can　be　seen　between　inlet　fluid　and　fluid　in　the　head.　It　is　found　that　distribution　basket　has　great　effect　on　convective　heat　transfer　coefficient.　The　distribution　of　local　convective　heat　transfer　coefficient　in　head　of　pressurizer　satisfies　the　0.2/sinθ　law.　The　results　can　be　used　as　data　base　for　safety　analysis　of　pressurized　water　reactor　(PWR).