Mrs Burnell said yesterday the performers were selected to attend the circus school at about five years old.
"They are from various parts of China and are selected at an early age to come to the school. They start their performance training and learn to look after their bodies as well as normal lessons."
She compared the performers to ballet dancers and said many of them would likely end up teaching their trade back in China in future.
The youngest performer on the tour was only 13 and the oldest 22.
She said rotation of performers was not relatively high but occasionally they did decide to return to China instead of signing up for another tour.
"Most of them sign up for at least one tour which is about a year.
"We've just started a new tour and lost five performers but they were replaced with another five."
Mrs Burnell said there was no shortage of performers willing to come to New Zealand.
Jenny Hou, part-owner and operator, said so far the tour had been very successful.
"We started a new tour in September and it's been very good so far.
"The performers are really enjoying it."
She said the most spectacular act was the wheel of death, where daredevils on motorbikes rode up the walls and roof of a cage.