Abstract: The interactions of nanomaterials such as carbon nanotubes, nanoTiO2 , nanoFe2O3 and nanoFe3O4. with biomolecules including amino acids, cells and biological bodies have been studied by the methods of molecular and cellular biologies, respectively. The results obtained show that these nanomaterials can all influence the prolification of the cell and structures or conformations of the biomolecules, while their toxicity is lower. However, the influence of some nanocorpuscles on the hearts of animals is considerable, which should be given serious consideration.