The Positron Factory has been planned at japan atomic energy Research Institue (JAERI). The factory is expected to produce linac-based monoenergetic position beams having world-highest intensities of more than 10~(10) e~+/sec. which will be applied for R&D of materials science. Biotechnology and basic physics & chemistry. In this article, results of the design studies are demonstrated for the following essential components of the facilities: 1)COnceptual design of a high-power electron linac with 100 MeV in beam energy and 100 kW in averaged beam power, 2) Performance tests of the RF window in the high-power klystron and of the electron beam window, 3) Development of a self-driven rotating electron-to-positron converter and the performance tests, 4) Proposal of multi-channel beam generation system for mononenergetic positrons, with a series of moderator assemblies based on a newly developed Monte Carlo simulation and the temonstrative experiment, 5) Proposal of highly efficient moderator structures, 6) Conceptual design of a local shiled to suppress the surrounding radiation and activation levels.
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