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Shanghai Synchrotron Radiation Facility (SSRF) is an intermediate energy (3.5GeV) light source under construction. Specially designed insertion devices will be required to realize the high brightness photon beams made possible by the low emittance electron beam. The first insertion device to be designed is a 4.2m long, 10cm period, APPLE-II type helical undulator, U10.0. The U10.0 will use a permanent magnetic configuration corresponding to four standard Halbach-type magnet rows which consist of two pairs of planar permanent magnet rows above and below the electron orbit plane. The C-frame support structure is selected. The design of U10.0, including magnetic structure, backing beams, support structures and drive systems, is described
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