To tackle the warming global environment, the hydropower should occupy the attention of the electric power generation systems as clean and cool energy sources with highest density. That is, we should make effort to utilize effectively not only the large scale hydropower but also the small/mini/micro hydropower without nature disruptions. To meet such requirements, the authors have proposed the counter-rotating type hydroelectric unit. The unit composed of the counter-rotating runners and the generator with double armatures. This paper prepares the several runners whose specific speed is from 120 to 580 m, m~3/s, min~(-1). The effects of the blade profiles on the hydraulic performances are investigated. As the result, these discussions give the design materials of the runners suitable for the applied water circumstances.
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