The International Organization for Standardization issued an international criteria 《Soil Quality-Determination of Soil pH》 (ISO 10390：2005) on Feb. 15, 2005. A comparison was conducted of the international method with the one used in the country to find out differences between the two in preparation of soil samples and soil suspensions, selection of electrodes, control of temperature and duration of shaking, compilation of test report. Findings of the study could be used as reference in improving the method for determining soil pH.