The book is a summation of the study by the authors on Herz spaces in recent 20 years.The content of the book mainly includes the following sides: decomposition characterization of homogeneous and non-homogeneous Herz spaces in terms of central blocks, decomposition characterization of homogeneous and non-homogeneous Herz type Hardy spaces in terms of central atoms and molecules, interpolations and duals for Herz type spaces and applications of above decomposition characterizations to boundedness of operators.