The entire Chinese economy used to ride high till the year 2008, thanks to massive increase in exports to US and Europe. China got over 30% of the GDP from exports and when the global economy went into a tailspin in 2008 end, the Chinese economy was hit the hardest.
The Chinese government realized the problem quickly and went into a massive 550 billion dollars stimulus spending since 2009 beginning. The Chinese authorities also ensured liberal low cost funding to individuals and companies since then.
That has lead to a massive 51% credit growth in the Chinese bank credits in the year 2009, which is record of sorts. That has led to the Chinese real estate prices zooming by over 50% on an average thereby increasing the consumer confidence.
That in turn resulted in the overall economic activity picking up in other sectors. How far this is sustainable is a billion dollar question, which even Chinese authorities cannot answer.