It is concerned that animal manure application to soils have been shown to result in relatively high nutrient runoff.In order to understand whether the addition of alum(aluminum sulfate) to the manure decreases runoff loss of pollutants from soils,a field experiment was carried out to study the effects of alum addition to manure on water soluble nutrients and heavy metals in the manure and runoff losses of nutrients and heavy metals from the field applied with animal manure.The results showed that alum addition to manure could decrease significantly the solubility of P and heavy metals in the manure.Water-soluble P in the manure treated with alum was 79.3% lower than that in the manure without alum treatment.Addition of alum to manure decreased significantly the concentration of P and heavy metals in runoff from field applied with manure.However,addition of alum to manure did not have significant effects on the concentration of total soluble N,NO_3-N and NH_4-N in runoff.Also,alum addition did not change significantly loss of Al in runoff from the experimental field and yield of vegetable.