His family was poor, and his father reluctantly supported him to go to primary school when he was a child. /kloc-after graduating from primary school at the age of 0/5, he worked at home. And studied ophthalmology with the teacher for 5 years. Gan Sheng was clever and eager to learn, and soon mastered medical skills and pharmacology. Shortly after the expiration of his apprenticeship, he started his own business and became an ophthalmologist. In the Republic of China 18 (1929), he joined the Zhang Nan guerrillas and served as an underground traffic policeman. Under the cover of ophthalmologists, he bought goods, medicines and delivered information for the guerrillas many times, which played a very good role in the work of the guerrillas. In 23 years, because of the traitor's betrayal, Lin Gansheng was arrested and imprisoned by the Kuomintang, imprisoned in Zhangzhou Gendarmerie Supervision Office, interrogated many times, forced to give up the whereabouts and work of underground guerrillas, and was tortured. In the face of the ferocious enemy, he was indomitable and kept his mouth shut. The enemy didn't get any news, was sentenced to death, and then was taken to the west school and shot.