This article will explain it better than I can China Cuts Bank Reserve Ratio to Spur Growth http://nyti.ms/zr5pCA
The cut frees money for lending at a time when the growth rate is expected to drop from last quarter's 8.9 percent to closer to 8 percent.
The cut is the second in two months. The bank had pushed the rate to a record 21.5 percent in June after consumer prices rose by a three-year high of 5.5 percent the previous month.