A fungicidal composition having a synergistic effect is provided. Thecompositioncomprises active ingredients A and B. The active ingredient A isbenzisothiazolinone, theactive ingredient B is one selected from benthiavalicarb-isopropyl, zoxamide,prothioconazole,boscalid, fluopicolide, or fluazinam, and the weight ratio of the twoingredients is from 1:50to 50:1. The test results show that the fungicidal composition according tothe presentinvention has an obvious synergistic effect, such that the application rate isreduced and thecost is lowered； and is useful in controlling certain particular fungaldiseases on grain crops,vegetables, and fruits with a broadened fungicidal spectrum, a retardedresistancedevelopment of the fungi, and an improved control effect.
