Dr. Li researches heavy metals-induced lung fibrosis; Reactive Oxygen Species (ROS), free radical, antioxidants, antioxidase, lipid peroxidation, and diseases; The molecular mechanisms of apoptosis; Toxicology of environmental and occupational toxicants; Epidemiology of cancer and Chronic Obstructive Pulmonary Disease (COPD);The signal transduction mechanisms of immunoreceptors; Fc receptor-like (FCRL) and Fc receptor for IgM expression and biological potential.