Coated urea fertilizer is a new type fertilizer to improve fertilizer's usage rate and solve the environment pollution questions.This paper aimed at present status that most researches assembled in chemical products,adopted different determine methods,represented the transformation characteristic of nitrogen among water and soil of the sulphureous urea,confirmed the nutrient release speed,found out the optimum determine method in agricultural production application.The research indicated that the conductance measurement could appraise the supply characteristic and velocity of slow release fertilizer fast and accurately and qualitatively,while soil culture method and water cultivation could determine its supply performance quantitative.