A fungicidal composition having a synergistic effect is provided. The composition comprises active ingredients A and B. The active ingredient A is benziothiazolinone, the active ingredient B is one selected from benthiavalicarb-isopropyl, zoxamide, prothioconazole, boscalid, fenamidone, fluopicolide, famoxadone, pyraclostrobin, picoxystrobin or fluazinam, and the weight ratio of the two ingredients is from 1:50 to 50:1. The test results show that the fungicidal composition according to the present invention has an obvious synergistic effect, such that the application rate is reduced and the cost is lowered； and is useful in controlling certain particular fungal diseases on grain crops, vegetables, and fruits with a broadened fungicidal spectrum, a retarded resistance development of the fungi, and an improved control effect.
