The blue and white porcelain tea set, also known as a treasure of human beings, was initially produced in Yuan dynasty and reached its peak in Ming and Qing dynasties. The porcelain is made by using cobalt oxide to paint patterns on the billet and burning it at high temperatures after glazing. With both blue and white in color, the porcelain looks bright, elegant and pleasing to the eye. Zheng He, a navigator in Ming dynasty, took a large amount of blue and black porcelain in his seven voyages to the western ocean to do business with more than 30 countries. Many rare and precious products have been collected by the museums in the United Kingdom and the United States.