Abstract: A closely relationship exits between water stress and prevailing of plant diseases.The plants severely depressed by water stress are easily infected by the some pathogens,for example,Macrophomina phaseolina,Dothiorella gregavia,Septoria musiva,Sphaeropsis sapinea,Cupressus semptrvirens,Endothia gyrosa,Lasiodiplodia theobromae,Bursaphelenchus xylophilus,Cytospora chrysosperma,Verticillium abbo-atrum,and Phytophthora cinnamomi et al.Here is a brief review on the relation and their mechanisms of water stress being involved in the development of plant diseases.