Gene therapy has been regarded as a great potential for specific treatment of gene-related human diseases, such as cancer, genetic and epidemic diseases. Gene therapy refers to the biomedical technology that inserts normal or therapeutic exogenous genes into target cells to repair or replace defective genes in target cells, so as to achieve the purpose of treating diseases. Efficient gene delivery systems are the crucial roles for successful implementation of gene therapy. This book provides a platform for young scholars and students to systematically understand the preparation and characterization of the existing non-viral gene delivery systems, as well as providing a technology platform for clinical gene therapy