Project of the invention is to provide a kind of composite granule stable long-term existence is in water. The present invention relates to a kind of composite granules, wherein, in the second coating that inorganic powder surface is formed with the first coating being made of hydrophobic organic compound and is formed on first coating, which is made of at least one kind of compound in the group that the hydroxide by the hydrate of Si oxide, Si oxide, the oxide of aluminium and aluminium forms.
