Cinnamomum cassia in Niulanshan belongs to oolong tea, which originated from Mazhenfeng. It is a famous variety of Wuyi Rock Tea, and also refers to cinnamon tea produced in Niulankeng area of Wuyishan District. Cinnamomum cassia in Niulanshan is made of fresh tea leaves from alpine tea gardens after secondary baking and kneading. When picking tea, you should choose sunny days, and when the new shoots are extended to open in the top leaves of buds, pick two or three leaves, commonly known as "open-face picking".