Milk has been a problem for many people in China. Trust of Chinese dairies has been low after some past disasters. Large milk powder companies struggle tend to import the milk they use because of quality control problem among the numerous small dairies that provide milk to large providers. Foreigners who like to use milk tend to buy ultra-high-temperature (UHT) treated milk that does not require refrigeration until it is opened, but the flavor tends to be poor from the heat treatment and nutritional value may be lowered as well.
After struggling with various brands of UHT milk and shying away from Chinese dairies for fresh milk, I finally found a brand of fresh that impresses me: Asahi milk. This is a Japanese company using good Japanese dairy methods on their Chinese dairy. The flavor of the milk is better than anything I remember in the US and tastes like fresh milk I enjoyed in Switzerland long ago. Really delicious. A liter will cost slightly over 20 RMB, about the same price for good quality UHT cartons of milk. But so fresh and delicious. Also, I think, safe and consistent in quality.