Gu yueqing taught Yu 1997 to obtain a doctor's degree in engineering from Nanjing university of aeronautics and astronautics, majoring in measurement technology and instruments, mainly studying the micro-invasive real-time monitoring of drugs in vivo by optical fiber sensors. /kloc-0 at the end of September, 1999, engaged in postdoctoral research at the University of Pennsylvania School of Medicine, mainly engaged in the distribution of near-infrared molecular probes in living animals. In 2002, he transferred to the University of Texas to study near infrared spectroscopy and imaging to monitor various clinical treatments. During this period, as the project leader, he was funded by the postdoctoral fund and the new researcher fund of the US Department of Defense, respectively. In 2003, he was hired as the research assistant professor of the Department of Biomedical Engineering. At the end of 2004, the Biomedical Engineering Laboratory was established in China Pharmaceutical University, which mainly applied various spectral and imaging technologies to all aspects of drug research and development, and was supported by several national natural science funds.