Last year, there were about 14,000 visits, compared to 8,000 in 2005, when the county became an approved destination for Chinese citizens.
Their spending, including at Bicester Village outlet, has also increased from almost Â£8m to more than Â£20m, according to Visit Britain.
A further rise has been predicted for the next ten years.
Martin Walker, from not-for-profit group Experience Oxfordshire, said Chinese tourists were "increasingly important" to the county's economy.
However, he said, the UK was currently "underperforming" with about 290,000 visitors a year, compared to countries such as France, which gets 350,000.
A number of attractions and travel organisations in Oxfordshire had signed up to the Great China Welcome initiative in a bid to encourage more visitors, he said.
In 2013, consultancy company Spectrum Insights found Chinese tourists spend 90% of their budget on shopping during UK visits.
It said Bicester Village was the most popular shopping destination in the UK, with 27% of Chinese visitors naming it as their favourite.
Keith Slater, a former director of several UK retailers, said bosses had "deliberately set out to market to the Chinese and to promote it as a must-go place."
"It's actually marketed as Bicester Village London, so is seen as part of the capital," he said.
"It's the designer brands, like Burberry, which really attract the Chinese and they prefer to buy a UK brand in the UK."

Mr Anwar, a criminal defence solicitor, received almost 4,500 votes from students.
The only female nominee, Lady Hazel Cosgrove, received the second highest number of votes at 1,400.
Mr Anwar will take over from intelligence whistleblower Edward Snowden who has served three years in the role.
Sir Vince Cable came third on 535 votes, with right-wing journalist Milo Yiannopoulos fourth on 533.
"It's a tremendous result - a landslide victory", Mr Anwar said.
"For me, it just encompasses the fact that students at Glasgow University do care.
"They've sent a message of unity against hatred and bigotry. They want their voices to be heard - they've fought for far too long and have been ignored."
He added: "They've entrusted me to be an active, working rector.
"I intend to keep all my pledges in the manifesto to fight for students, all students, to fight for the issue of mental health, to fight over rocketing rents, to fight over the issue of Brexit and to ensure that no student should suffer in silence at this university and that they get the backing and funding and support of everyone at this campus."
First Minister Nicola Sturgeon offered her congratulations to Mr Anwar on Twitter.
The number of Chinese visitors to Oxfordshire has almost doubled in the last ten years, figures have shown.
[NEXT_CONCEPT]
Human rights lawyer Aamer Anwar has been elected as the new rector of the University of Glasgow.