The preserve now has 111 pandas, a huge increase from its original population of six in 1987.
The pandas bite off the hard outer part of the stalks and eat the soft fibres within.
Most importantly, these mountains were covered in bamboo, making Jiuzhai a haven for pandas.
Five other pandas have been born at the zoo since 1983, but all died within days.
Last year the pandas were introduced to each other several times but did not mate.
Improved ties between the two sides made the delivery of the pandas possible, Xinhua reported.
The latter is one of only four in the nation with Giant pandas, a major draw.
The giant pandas, who are both nine years-old, were introduced to each other on five separate occasions.
Any cubs would remain in Edinburgh for two years before the pandas are returned to the Chinese.
In Sichuan province, WWF says, suitable habitat occupied by pandas shrank by 50% between 1974 and 1989.
The fate of polar bears weighs on our collective conscience more than pandas because of melting ice caps.
Since the adult pandas are strong and can be dangerous, the guests feed them bamboo through the bars with long sticks.
Throughout the past week the zoo swapped the pandas between enclosures in an effort to prepare them for mating.
The pandas have one surviving cub, Tai Shan, who was born July 9, 2005, and now lives in China.
Known for its mountains, the area is near a well-known preserve for pandas.
Television presenter Chris Packham said the take-off, flight and landing should not have been particularly onerous for the pandas.
In the Himalayas, the numbers of endangered species like snow leopards and red pandas have been growing as well.
Dozens of pandas were moved to Bifengxia from another preserve, Wolong, after its habitat was wrecked by the 2008 quake.
Once inside their enclosure, the pandas were driven by lorry to Chengdu airport where they were inspected by wildlife authorities.
It is all very normal and all part and parcel of giant pandas - it's just really a waiting game now.
This includes the forthcoming WoW Mists of Pandaria expansion pack, which introduces a new continent populated by martial-arts-skilled pandas and their pets.
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Dr Jon Lovett, who led the work at York University, said ecological changes would predominantly influence pandas to decide where to live.
Selling some 70, 000 new Pandas is supposed to do much of this.
Edinburgh Zoo's pandas could be introduced to each other for mating later.
China said in May 2005 it would give the island two giant pandas, but their departure was delayed for more than three years.
The pandas housed in Ya'an include 40 that were moved there after the 2008 quake damaged the main panda research base in Wolong.
The pandas failed to breed in 2012 but the zoo is using thermal imaging technology to monitor the pair this time - a world first.
There are about 600 pandas left in the wild: more than half the bamboo forests where they live have disappeared in the last 30 years.
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The WoW Mists of Pandaria expansion pack was released in September, offering players access to a new continent populated by pandas skilled in martial arts.
He said there would also be an increase in enclosure swapping, allowing the pandas to smell each other's scent and mark in each other's enclosures.
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