Twenty year old mango cvs. Dashahari, Langra, Chuasa and Fazri growing in Horticulture Research Station Patharchatta of G.B. Pant University of Agriculture & Technology, Pant Nagar treated with 0-5 g, 1.0 g/meter canopy diameter of Paclobutrazol (applied to the soil drench on 15 September 1997 and 15 October 1998 with control). The biennial bearing is very serious problem in north, east and central Indian commercial cultivars, while most of the south Indian varieties bear regularly. Therefore, application of cultar is most widely studied in view of its high potential for controlling plant growth and development of fruit crops in general and mango production in particular. The persistence of cultar in orchard soil for a long time and its half-life varies with soil type and climatic conditions, which may severely affect the development of subsequent crops and moved rapidly between the shoot tips and basal nodes both in the acropetal and basipetal directions and persisted for several months. It inhibits gibberellins biosynthesis at kaurene stage and has proved to be reduction of vegetative growth, promising for flower initiation in shoot bud, giving early and profuse flowering, increases fruit yield and improving quality regularly in alternate bearing cultivars. Data's are collected with three months of interval of deffrent perameters of vegetaion. All rates of paclobutrazol reduced growths and number of leaves including tree perameters. Chemical used Paclobutrazol [(2RS, 3RS)-1-(4-chlorophenyl)-4, 4-dimethyle-2- (1, 2, 4 Triazol-1-yl)] pentan-3-ethanol.