The type and devepment of soil are related nonexchangeable potassium in soils of the loess regzon. The present paper deals with the regime of nonexchangeable potassium in major soil types of the loess region. The results obtained are summarized as follows: (1) The primary factors affacting nonexchangeable potassium content and potassium release were the soil texture and the organic matter. The nonexchangeable potassium content were positively correlated with the contents of silt, clay and organic matter, but negative correlated. with content of sand in soil. (2) The content of nonexchangeable potassium and accumulative amount of potassium released were getting increased from north to south in loess region. The. distribution of nonexchangeable potassium and fhe accumul are amount of potassium released in young soils (sandy yellow cultivated Loessial soil and light dark loessi.al soil and yellow cultivated loessial soil), sandy dark loessial comparatively uniform in profile. However, in argillic horizous of clayey dark loessial soil and dark loessial soil, the content of nonexchangeable potassmm and released potassium was higher than in cultivated horizon and parent materia horizon, and it changed with topographic conditions of the soils.