The　kinematic　transmission　property　and　distributions　in　work　space　of　a　novel　3-DOF　3-P-2SS　spherical　platform　manipulator　whose　optimum　kinematic　transmission　property　is　at　the　origin　position　were　given.　The　orthogonal　layout　feature　of　the　parallel　manipulator　is　described　and　its　kinematic　transmission　equations　are　developed　based　on　its　inverse　displacement　equations.　The　kinematic　transmission　indices　of　a　3-DOF　3-P-2SS　spherical　platform　in　direction　of　x,　y　and　z　are　defined,　respectively,　so　that　the　distributions　of　the　indices　in　work　space　are　given,　which　is　significant　for　task　planning　of　the　manipulator.