Molecular imaging is the technology that successfully combined molecular biology and clinical medicine, and it will be one of potential fields of medicine in the future. Generally, there are three advantages on molecular imaging research: first, it can transform complicated processes of gene expression and signal transduction into image visually, and that one can realize the possible disease mechanism and features; second, it’s able to find early on molecular variations of disease and the process of pathology; last, it can in vivo observe continuously the mechanism and effect on drug or gene therapy. Molecular imaging integrated molecular biochemistry, data processing, nanotechnology and imaging processing, and then it possesses the properties of high specificity, high sensitivity and ultra-high spatial resolution.