A pot experiment was conducted to study the effect of potassium humate (salt of humic acid) on vegetative growth and protein contents of Glycine max (L.) Merrill and Phaseolus mungo (L.). For the study of various vegetative characters ( height of plant, number of branches per plant, number of leaves per plant, diameter of canopy, stem diameter, root length and shoot length) and protein contents of Glycine max and Phaseolus mango, one percent potassium humate solution was used as treatment and water served as control. The vegetative characters and protein contents of Glycine max and Phaseolus mungo were studied after 57 and 41 days from sowing respectively. Results obtained during this investigation clearly indicated that potassium humate treated plants showed significantly increased on vegetative characters and protein contents of Glycine max and Phaseolus mungo than control plants (untreated plant).