Abstract: This paper is a part of the research project on ornamental and floral plant diseases in China and of a project supported by the National Natural Science Foundation of China. Ten fungous diseases on ten species of garden trees and flowers in Kunming, Chengdu, Chongqing, Guiyang and a few other places are listed. Among them three diseases are reported for the first time in China and seven diseases are reported for the first time in Yunnan, Szechuan and Guizhou provinces. The morphological characteristics of 10 species are described and of 4 species are illustrated. Specimens are deposited in Mycological Herbarium of the Plant Pathology Institute of Yunnan Agricultural University(MHYAU), Kunming. Three diseases are records of known species in China i. e.1. Diplodia euonymi West, causing leaf spot on Euonymus japonicus(Celastraceae), found in Kunming occasionally. 2. Phyllostocta euonymi Tharp causing grey spots on Euonymus aeotus(Celastraceae), found in Chongqing commonly. 3. Puccinia oxalidis Diet, et Ellis causing rust on Oxalis grizjithii(Oxalidaceae) found in Kunming commonly. Seven diseases are records of known species in Yunnan, Szechuan and Guizhou provinces, i.e. 1. Phoma minutula Sacc. Causing spot blight in Hoya cinnamomi(Asclepiadaseae),distributed in Kunming occasionally. 2. Phyllosticta bougainvilleae Wu. Bai et Zhang causing leaf spots on Bougainvillea sfxctabilis(Nyctaginaceae), found in Kunming commonly. 3. Phyllosticta nandinac Tassi causing leaf spots on Nandina demestila(Ber-beridaceae), found in Chengdu occasionally, 4. Phyllosticta prunicota(Opiz) Sacc. causing leaf spots on Prunus mume(Rosaceae) found in Chengdu occasionally. 5. Phyllosticta populea Sacc. causing grey spots on Populus yunnanensis(Salicaceae), from Kunming, commonly found. 6. Pleochaeta shiraiana(P. Henn) Kimer. & Korf causing powdery mildew on Celtis sinensis(Ulmaceae), from Guiyang, commonly found. 7. Uromyces dianthi(Pers.) Niessl. causing rust on Dianthus chinensis(Caryophyllaceae), from Gen- gma, Yunnan, commonly found.