The most famous hot spring center north of Yazhuang is its mud bath. The mud bath looks dirty and green. After washing, it will make the skin white and slippery. After washing, it will soak in a hot spring again. It is quite pleasant! The hot spring center has a good environment. It is worth mentioning that the size of the pool is arranged according to the number of people there. Every group of visitors from the same industry changes a pool of green mud or hot spring water, which is quite clean.