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To study the moldy condition of feed mixed with corn, soybean meal and bran at the ratio of 1:1:1 at the addition amount of 5% and 10% rapeseed oil, lard and mixed oil (rapeseed oil + lard) at 35 °C, 15% moisture concentration. Seven mixed feeds with the same quality were taken. Three respectively mixed with 5% of the rapeseed oil, lard and mixed oil (rapeseed oil + lard). Three respectively mixed with 10% of the rapeseed oil, lard and mixed oil (rapeseed oil + lard). One as the control sample. Put seven samples at 35 °C in the incubator, in 20, 40 d to determine the seven samples feed moisture, crude ash, crude protein, pH value, crude fat. The seven samples were tested with aflatoxin B1 and zearalenone test papers. The results showed that added 10% mixed oil, the amount of mold was the largest. The test results of aflatoxin B1 test paper and zearalenone were negative. Different oil types had significant effects on moisture, crude ash, crude fat, pH value of the feed. Different oil types had no significant effects on crude protein of the feed. Different amount of oil added had significant effects on crude protein, crude ash, crude fat, pH value of the feed. Different amount of oil added had no significant effects on moisture of the feed. The experiment indicates that feed mildew can reduce pH value of the feed. Rapeseed oil and lard do not promote the growth of aflatoxin B1 and zearalenone. [ABSTRACT FROM AUTHOR]