With the increasingly degraded water environment, some substances will gradually accumulate in our drinking water source—the surface water, and finally threaten drinking water safety when their contents reach a certain amount. To give early warning on those potential threats to water safety, we can choose corresponding water quality control indexes, i.e. water quality factors, to take proper countermeasures by building a water quality model simulating change trend of the water source quality based on historical data, which is favorable for ensuring the water source quality.