Cypress forest is one of the most valuable resources in Taiwan's forest. It consists of Chamaecyparis obtusa var. formosana and Chamaecyparis formosensis, the former we usually call yellow cypress and the latter red cypress. Over the past eighty years, cypress timber production has played a very important role in the forest economy of Taiwan, especially in the period from 1960 to 1987. About 12million m^ 3 of cypress timber was harvested during this century, 18% of them or 2.36 million m^ 3 was exported. The main export market was Japan. But most of the harvested timber (about 82%) was consumed in domestic market. Because wood quality of cypress is very fine and price of the timber is expected to be higher in the future, it is recommended that Taiwan's cypress forests be managed intensively.