Charge characteristics of a typic Gibbsihumoa (Halii soil) and a hydric Dystrandept (Maile soil)were investigated. The specific surface of Maile soil is about two times greater than that of Halii soil. The pH₀ of Maile soil equal to 5.90 and pH₀ of Halii soil equal to 4.55 specifically, adsorbed calcium ions shift the pH₀ to lower values and specifically adsorbed sulfate anions shift bhe pH₀ to higher values, when CaCl₂ or Na₂SO₄ and CaSO₄ are used as the supporting electrolytes. It was found that a positive permanent charge existed for the Halii soil and a negative permanent charge existed for the Maile soil by using the surface charge model developed by Uehara and Gillmsn.