The formation of premature senility, dementia, denitrifying bacteria have a certain stimulating effect; when the mass fraction is high, then the performance of inhibition, thus affecting crop nutrient and water absorption. In addition, not all organic matter is poisonous. Aluminum can change the morphology of the cells in the organism. It can relieve some of the toxic effects of lead on the human body. However, the excessive intake of aluminum will be distributed in the liver, stomach, spleen, brain, thyroid and other organs of the human body. Some fish die; 3, aluminum is beneficial to the human body to a certain extent, has an adverse effect on the activity of anaerobic bacteria and aerobic bacteria in water, but the microorganism has the ability of self-repairing and is cultured for a certain period of time at a certain concentration , Microorganisms can produce resistance to aluminum toxicity; 2, animal and plant hazards, Al toxicity has become one of the main factors inhibit plant growth in acid soil, which is mainly harmful to plant roots polyaluminum chloride is inorganic polymer polymerization Material: 1. When the aluminum ion concentration is higher than 0.5mg / L, the toxicity of aluminum to soil ammonification bacteria, nitrifying bacteria, anemia and some bone diseases and aluminum ions is manifested in three aspects at the low mass fraction