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This study is to investigate the insulation performance of lightweight concrete using recycled lightweight aggregate, and to develop lightweight concrete products which have an excellence on the insulation performance satisfying with properties of building materials. As a result of this study, recycled EPS aggregate is considered to have an independent pores which is closed by dense partitions. So, it is showed that the insulation performance of lightweight concrete using recycled EPS aggregate is excellent. Especially, in the case of lightweight concrete under conditions of replacement ratio over 100%, it is considered that insulation performance is very excellent as thermal conductivity is showed about 0.2㎉/mh℃.Considering the relation between ultrasonic pulse velocity and unit weight & thermal conductivity through the graph, the result of relation between ultrasonic pulse velocity and unit weight & thermal conductivity on the graph expressed their high interaction shown as direct proportion on the graph. Therefore, it is possible to extract the insulation performance of lightweight concrete using recycled EPS aggregate by ultrasonic pulse velocity and unit weight.