Abstract: There are many kinds of chicken coccidian. At present, the eight species are recognized in worldwide. The most harmful is Eimeria tenella and Eimeria necatrix from the eight species， that is one of serious, multiple and difficult prevention and control diseases in chicken industry, its mortality rate is 40% to 50%.In recent years, farmers lacked the knowledge of disease prevention and control can not reasonable selection and scientific application of drugs to cure coccidiosis, increasing drug resistance ceaseless, coccidiosis in certain region is always widely prevalent. The paper explained the reasonable application of anticoccidial drugs for reducing drug resistance, which was more effective in the treatment of chicken coccidian.

Key words: coccidiosis; anticoccidial drugs; reasonable application