When　it　comes　to　the　researches　of　valve-less　pumps　with　nozzle/diffuser　elements　of　different　cone　angles,　they　were　usually　achieved　by　manufacturing　plural　pumps,　and　the　number　of　the　pumps　is　determined　by　the　accuracy　of　experiments　required.　However,　the　traditional　way　in　which　finite　pumps　of　different　cone　angles　were　used　to　simulate　the　changeable　cone　angle　and　it　would　probably　conceal　some　properties　of　the　nozzle/diffuser　elements.　Meanwhile,　many　parameters　of　the　nozzle/diffuser　elements　other　than　cone　angle　can　not　be　kept　in　consistency.　In　the　research,　a　new　kind　of　2-Dimensional　nozzle/diffuser　elements　whose　cone　angles　are　changeable　is　created,　and　the　cone　angle　of　the　new　nozzle/diffuser　elements　can　be　adjusted　through　adjusting　the　position　of　the　changeable　flow　passage.　Furthermore,　when　liquid　flow　through　nozzle/diffuser　element,　the　nozzle/diffuser　elements　could　make　consecutive　loss　coefficient,　which　makes　the　changes　of　flux　and　flow　direction.　And　the　kind　of　pump　with　the　new　structure　was　developed　in　the　research;　the　effectiveness　and　usefulness　are　also　demonstrated　and　proved　in　the　experiments.　Copyright　©　2005　by　ASME.