柞蠶繭是我國的特產,它主要的產區是遼寧、吉林、山東、河南、貴州等省,其中又以遼寧省的產量為最多,因遼省境内山脈縱横,有長白山脈、自東北而西南交互着中部的千山山脈,向西南伸入黄海與渤海之間,而西南部有松嶺山脈及巫閭山脈伸入了渤海灣。東起鸭綠江西至山海關,其间丘陵山脈起伏,山林錯綜,柞林遍佈了四十餘縣。並且在緯度三九——四三度之間。壯蠶期正值雲量少、日照長的季節,形成了天然的二化性蠶區。所以其柞繭的總產量佔世界的百分之70％以上。因此,柞蠶工業是遼寧省紡織工業的主要工業。在一九三一年之前,遼寧地區柞繭的正常年產量 Tussah cocoon is a special product of our country. Its main producing areas are Liaoning, Jilin, Shandong, Henan, Guizhou and other provinces, among which Liaoning Province has the most output. Due to the vertical and horizontal mountains and valleys in Liaoning Province, there are Changbai Mountains, northeast and southwest Interaction with the central Qianshan Mountains, southwest extends into the Yellow Sea and the Bohai Sea, while the southwest Songling Mountains and Wuliu Mountains into the Bohai Bay. Yalu from east to west of Shanhaiguan, during which hilly mountains and downs, mountains and forests, oak forest throughout the more than 40 counties. And in the latitude between thirty-nine three degrees. The positive period of the strong silkworm sericulture period, the long sunshine season, the formation of a natural two sericulture area. So its total output of oak cocoons accounted for more than 70% of the world. Therefore, tussah industry is the textile industry in Liaoning Province, the main industry. Before 1931, the normal annual production of tussah cocoons in Liaoning Province