Potassium humates were extracted from leonardite by 0.3 M KOH in from salt. The optimum condition for preparation of those compounds such as pH,time and temperature for extraction and centrifugal speed for precipitation were studied.The results revealed that optimum condition for potassium humates preparation was; extraction at room temperature (25 c),at pH 12.5-13.0 for 4 hours.The supernatant solution was separated and acidification of the supematant with 0.1 M HCl(pH 2.0-2.5 ) and left stand for 4 hours thereby precipitating the humic salts as a solid precipitation. The salt was characterized by using FT-IR and compared with commercial potassium humate.Some of metals content in potassium humate were also investigated