In the present work,a novel method for preparation of nitro-terminal group-containing SEM hapten was established by a reaction of SEM with 4-(3-aldehyde-4-nitro-phenoxy)-butyric acid s, which introduced a reactive terminal nitro groups into SEM structure. The prepared SEM hapten was then coupled with bovine serum albumin(BSA) and ovalbumin(OVA) respectively to prepare SEM-BSA immunogen and SEM-OVA coating antigen. The BALB/C mice were immunized with immunogen SEM-BSA, and the monoclonal antibodies were prep...