NMR has been widely applied to well logging and formation evaluation since 1990's. NMR core analysis, NMR wireline logging, NMR logging while drilling,as well as down hole NMR laboratory have been developed and available to the industry, which provide unique information to fluids identification and Petrophysical analysis. The NMR information provides： 1,lithology-independent porosity; 2,clay bound water, capillary bound water, and free fluids; 3,permeability; 4,oil and gas in free fluids; 5,fluids NMR properties at down hole conditions, etc. The availability of the NMR information dramatically enhances the accuracy of well logging fluids evaluation and makes the reserve calculation, Producibility estimation and stimulation evaluation feasible and much reliable. In this paper, referred to author´s new publication, NMR logging principles are briefly introduced, applications case studies to porosity, permeability, and oil and water saturation are discussed in details.