The “high temperature performance characteristic numbers” were adopted to evaluate the high-temperature performance of iron ore fines. Based on the experimental analysis of high temperature performance of single type of iron ore fines, the experimental study on high temperature performance of mixed ores was added. By experiments of mixing two kinds of iron ore fines, mixing three kinds of iron ore fines and mixing four kinds of iron ore fines, the relationship between high temperature of single type of ores and high temperature of mixed ores was presented. It is found through the experiments that, the high temperature of single type of ores and high temperature of mixed ores are close to meet the linear correlation, which can be used to guide the ore proportioning.