China's central banks cuts the reserve requirement ratio, the amount of money banks need to keep at the central bank, by half a percentage point. Banks are required to use the money that is freed up of $100 billion to help heavily indebted companies and small business lacking collateral to get new loans.
This is a response to the Trump tariffs on $100 billion of Chinese goods with a equal response from China and the trade war between China and the U.S., so that the Chinese economy can be bolstered before the impact of the tariffs hurts the economy. In the past China was reluctant to reduce the reserve requirement. Chinese debt soared with local government debt and debt accumulated from the 2008 large stimulus in the financial crisis.