The dyke experiences very high flood level more and more frequently. The timely issued " The Standard of Dyke Design" has played an important role in the design, measure fea sibility study and examination of dyke reinforcement. Safety appraisal is required before dyke rein forcement design. But, the conducted item is safety demonstration in the process of dyke reinforcement design at present. This paper suggests that at least 8 aspects should be considered in safety demo nstration. The effective water head is considered as the most important factor for dyke safety and reinfo rcement design. Seepage control measure design is an important part of dyke reinforcement design . Its correct train of thought is discussed in this paper. Some other factors for dyke reinforcement d esign are also pointed out.
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