As a new and efficient heat transfer medium,mixed nanofluids are widely used in various fields such as cooling,heat dissipation,cutting,lubrication,etc.The preparation,thermal characteristics,stability and application of mixed nanofluids are summarized.A detailed overview is given to measurement and prediction models of thermal conductivity of mixed nanofluids,and data analysis is conducted on the prediction accuracy of each model.Meanwhile,the stability control technology for mixed nanofluids and the stability time of various mixed nanofluids are introduced.