Pool　boiling　heat　transfer　on　horizontal　metal　foam　surface　with　U-shaped　and　V-shaped　groove　configurations　was　investigated　experimentally　in　deionized　water　at　atmosphere　pressure.　The　boiling　patterns　were　gained　with　a　high-speed　camera.　The　foam　porosity,　foam　thickness　and　pore　density　were　fixed　as　0.95,　2　mm,　and　130　pores　per　inch,　respectively　The　U-shaped　and　V-shaped　grooves　were　manufactured　in　the　studied　foam　samples　with　three　widths　(1,　2,　and　3　mm)　and　three　groove　number　values　(1,　2,　3)　The　existence　of　grooves　can　delay　the　critical　heat　flux.　The　boiling　heat　transfer　mechanisms　for　the　grooves　are　discussed　with　prevailing　influenced　factors　including　bubble　escaping　resistance,　heat　transfer　surface　area,　or　capillary　force　in　the　boiling　process　The　foam　surface　with　U-shaped　grooves　provides　enhanced　boiling　heat　transfer　at　higher　heat　flux　(q　＞　5.0　x　10(5)　W.m(-2))　An　optimal　U-shaped　groove　number　of　2　and　a　groove　width　of　3　mm　were　gained.　The　heat　transfer　performance　difference　between　U-　and　V-shaped　grooves　is　related　to　the　groove　number.　Particularly,　the　V-shaped　grooved　foam　surface　provids　superior　performance　to　the　U-shaped　groove　at　the　highest　groove　volume　ratio　of　36%　in　the　whole　experimental　heat　flux　range.