Coach Jason Lee admitted he would have preferred to score more and conceded that the in-form Hockeyroos will represent a different task for his team, after they beat Germany on penalties.
“It was a good game to win, although we would have liked to score more," he said.
"There is no doubt that we were in charge across the 70 minutes; China did not have a single attempt on goal all night.
“In my opinion Australia have been the team on form so far this year and certainly have played the best hockey in this tournament alongside the Netherlands.
"Last time we played them was in the World League semi finals; it was a tight affair there and I’m sure it will be the same on Saturday. Both sides will get their chances, but it will come down to who will take them.”
Susie Gilbert, making her 100th international appearance, secured the penalty stroke in the 46th minute and Twigg was unerring from close range.
England keeper Maddie Hinch had a watching brief as her well-drilled defence kept China quiet while Lily Owsley, Alex Danson and Kate Richardson-Walsh all had chances to increase England's advantage.
“It was a good team performance, we controlled the game from start to finish and defended resolutely all night," said Gilbert.
"It was great for Twiggy [Georgie] to score the penalty stroke in the second half and I think it was just reward for us."
In the other semi-final, the Netherlands - 1-0 winners over New Zealand - will take on Argentina, comfortable winners against Korea.
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