The orthotopic cancer model considers the interaction between tumor cells and their surrounding interstitial organ microenvironment and monitors tumor growth in drug efficacy evaluation. We can break down the barriers of experiment and technology with mature orthotopic transplantation models, including brain orthotopic transplantation, liver orthotopic transplantation, lung orthotopic transplantation, tibial bone marrow cavity orthotopic transplantation, and intravesical orthotopic transplantation.