This study is to investigate the ability to inhibit 4 fungal pathogen species: Colletotrichum sp., Rhizoctonia sp., Rhizopus sp. and Sclerotium sp. of three extracts from Imperata cylindrical (L.) Beauv., Melastoma sp. and Phyllanthus amarus in ethanol and methanol solvents under invitro conditions. All extracts were determine the polyphenol and saponin contents with high concentration. The antioxidant capacity of all extracts were strong through reducing power and hydrogen peroxide radical scavenging methods. Testing of plant fungal pathogens inhibition was studied by the method of agar well diffusion, at concentration of 100 mg/mL, all plants extracts were showed effective inhibition. In particular, the strongest inhibition was Rhizoctonia sp. with the diameters of the inhibition zone by Melastoma sp., and Sclerotium sp by Imperata cylindrical (L.).