In order to study the adjacent benzene two formic acid di isononyl ester (DINP) and adjacent benzene dicarboxylic acid diisodecyl ester (DIDP) combined exposure toxicity effect on immune system in mice with and without cooperativity. The 56SPF BALB/c mice, were randomly divided into 7groups, with the different mass ratio of DIDP and DINP mix of chemicals at the same concentration (200mg/kg) on mice were intragastric exposure, the period was 28days. After the end of exposure, the ear tissues were taken to measure the ear swelling index and ear w...