Professor Tao explores the electrorheological (ER) and magneto-rheological (MR) effect on complex fluids, including blood, liquid chocolate, and crude oil, etc. Sever hypertension comes with headaches, chest pain, shortness of breath… Lowering blood pressure requires reducing blood viscosity and suppressing turbulence. However, these two tasks conventionally conflict each other. A lower isotropic viscosity leads to a higher Reynold number, indicating worse turbulence. Based on the MR effect, a magnetic hematology device is invented to simultaneously reduce patients’ blood viscosity along the flow direction and suppress turbulence, curing their hypertension. Tao also utilizes the ER effect to reduce the viscosity of liquid chocolate and the fat level in chocolate, making it healthier and tastier. In addition, the ER effect further leads to a new technology to reduce crude oil viscosity, suppress turbulence in pipeline and improving engine efficiency. He has also investigated superconductors in a strong electric field, examining the fundamental physics related to the interactions between superconductors and electric field. His work in quantum Hall effect is regarded as the starting point of topological quantization and topological phases of matter. Recently he also explores new treatment with strong magnetic field to disassemble blood clots for Covid-19 patients with severe thrombosis.