According to occupational diseases compensated record from Labor Insurance Bureau, an employee of silica and manufacturing dead for pneumoconiosis. Patient’s pneumoconiosis symptoms were showed after six years’ working in an environment full of silica particles. In this case, the patient was exposed to high contents of crystalline free silica, and that caused him to Accelerated Silicosis. The authors visited the silica sand manufacture and measured the contents of particulates. The business unit, categorized as grade 1 in physical examination for preventing occupational diseases, which showed a dramatic gap in occupational diseases compensated record of labor insurance.