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This study is to investigate rheological properties(slumping behavior & segregation resistance) of ultra-lightweight concrete and present fundamental data for mixing design of ultra-lightweight concrete. As a result of this study, it is suggested that slump target for quality control of fresh ultra-lightweight concrete will be set up differently from normal concrete. Because, unit weight of ultra-lightweight concrete is much smaller than normal concrete, though rheological constants(yield value) of NC is the same as LC's, these slump values are very different. And, segregation resistance can analysis as quantitatively taking advantage of unit weight of ultra-lightweight concrete. lightweight concrete using ultra-lightweight aggregate showed segregation when the slump is more than 20cm, also the more quantity of paste have, the movement of aggregates cover a wide range.