Abstract: In China coal accounts for 75% of the total consumption of primary energy. Trace elements in coal are important because of their close association with environmental issues and the health of plants, animals and human beings. Consideration must be given to essentiality, nonessentiality and toxicity that depend on concentrations, forms of existence of elements．pH and oxidation-reduction conditions, and other factors. There are many hazardous minor dements in coal-waste rocks. With the action d leaching by rain and water,some hazardous minor elements will be dissolved completely or partly and be separated from coal-waste rocks into water of soil environment. Consequently, they would pollute water quality, destroy soil function and influence ecology development and human health. Leaching is an important way of environment pollution while hazardous minor elements are leached out from coal-waste rocks and ashes. In this paper, based on the leaching experiments, leachable contents of hazardous minor elements from coal-waste rocks are studied in relation to their forms of occurrences and contents in coal-waste rocks, leaching times, leaching temperatures, and the pH values of the media. The higher temperature of leaching media and the longer leaching time, the higher leachable contents of hazardous minor elements. In the course of leaching, different hazardous minor elements are differently effected by pH values of leaching media.