It is a common method to estimate the design wave parameters by wind wave hindcasting method in the case that there is no observed hydrologic data at engineering site. This paper discusses the defect in the nomogram for calculating deep-sea wind wave factors in Chinese Code of Hydrology for Sea Harbor, and analyzes it comparatively with wind wave hindcasting method in a new edition of Coastal Engineering Manual (CEM) by U.S. Army Corps of Engineers. The conclusions will be references to hindcast wind wave in higher accuracy for coastal and offshore engineering practice in China.