In the past decades, some immunotoxicology studies on GM crops or the proteins expressed by exogenous genes were conducted worldwide. In the European Commission project SAFOTEST (New methods for the safety testing of transgenic food), immunotoxicological effects of transgenic rice were assessed [6]. Moreover there were a few adverse evidences of genetically modified crops on immune system. Finamore's study observed that maize genetically modified with Bacillus thuringiensis(Bt) Cry1Ab gene induced alterations in the percentage of T and B cells and of CD4+, CD8+, T subpopulations, as well as increases of serum IL-6, IL-13, IL-12p70, and MIP-1beta in mice fed for 30 or 90 days [7]. A health survey showed that exposure to Bt sprays may lead to the allergic skin sensitization and induction of IgE and IgG antibodies to Bt protein in farm workers who had sprayed pesticides [8]. These studies implied that general immunotoxicological examinations of genetically modified crop and Bt protein may be considered to some extent.