In this letter,normalized method is proposed and deduced in detail for photonic crystal fiber(PCF) s effective mode area analysis and design.The validation and the implementation of the normalized effective mode area is also presented by multi pole method.For a class of PCFs with same air-filling fraction but different cladding air-hole pitches,numerical computing the effective mode area only needs to be carried on a certain model.The effective mode area of the PCFs for the rest of the class can be readily obtained by a simple and time-saving coordinate scaling.By employing this method,the PCFs effective mode area analysis and design could be greatly simplified.