The microcapsule loaded with DNA was prepared with solid nanosilica microspheres as templates.Silane coupling agent was used as a glue to absorb DNA on the surface of SiO_2.Amino groups on the surface can improve the electrostatic attraction between SiO_2 and DNA.PEI and PAA were absorbed on the microspheres alternately due to the electrostatic attraction to form DNA loaded microspheres encapsulated with polymer layers.The process of layer was characterized by layer self-assembly via the zeta potential meas...