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Development of the high power EUV (extreme ultraviolet) source has been expected as a light source for the next generation lithography. There are two kinds of EUV sources: the discharge produced plasma (DPP) and the laser produced plasma (LPP). The DPP method is considered to be promising in easiness of radiating the high power EUV and in the cheapness of constructing the EUV source. The Z- pinch plasmas driven by pulsed power have been used mainly in the DPP method. Here, the research results of the DPP method at Kumamoto University are summarized.