New Zealand coach Tony Readings said the win marked a number of important milestones for the Football Ferns.
"We keep calling on these players to get better every game and by winning this tournament and backing up the Brazil win we've taken more big steps forward.
"It was also important for our team to beat China away from home as that again is something we've never done before.
"We're still working towards major goals in 2015 and 2016 but we will savour winning this tournament and the progress it represents for us.
While Readings acknowledges the first half wasn't an improvement on the performance against Brazil, he praised the ruthless response after the break.
"It's nice to win a trophy but the clinical performance in the second half is a big plus. We've never done that against a team of this calibre so adding that piece to the jigsaw is massive for us."
Defence dominated in a scrappy first half with New Zealand centre backs Abby Erceg and Rebecca Stott impressing and allowing China few chances. That, and the weight of possession New Zealand enjoyed, laid a platform for the second half onslaught.
"We've developed a new style of play but still remain stubborn in defence," noted Readings.
"We've kept two very good teams in Brazil and China scoreless and our keepers weren't really tested today.
"We are trusting ourselves to keep the ball and wear teams down. You could see China tiring and the first goal broke their spirit. After the second goal the game was over.
"That's a few games now where we've worn teams down through possession and scored in the second half."
Among the substitutes, seventeen-year-old Cantabrian Meikayla Moore made her senior debut late in the second half.
Next up for the Football Ferns is a pair of glamour matches against Olympic champions and World number one USA in San Francisco in October 27 and Columbus, Ohio on October 30.
Valais Cup 2013 Final
New Zealand 4 (Hannah Wilkinson 63', Amber Hearn 65', 88; Rosie White 84')
China 0