According　to　rigorous　procedures,　an　experimental　study　was　carried　out　to　investigate　the　effects　of　jet　exit　velocity,　flow　direction,　fluid　subcooling　and　nozzle　diameter　on　hysteresis　of　boiling　heat　transfer　with　impinging　circular　submerged　jets　of　highly-wetting　liquids.　The　experimental　results　showed　that　incipient　boiling　point　decreased　with　the　increase　of　fluid　subcooling　and　was　independent　of　other　factors,　and　that　temperature　overshoot　enhanced　with　the　decrease　of　jet　velocity　and　fluid　subcooling.　Corresponding　explanations　were　given　in　view　of　boiling　mechanism　of　highly-wetting　liquid.　At　last,　several　means　were　listed　to　decrease　or　eliminate　the　hysteresis　phenomenon　of　boiling　heat　transfer.