For the maneuverability problem of intelligent sorting manipulator reachable workspace, the threedegreeoffreedom Delta parallel sorting manipulator was researched. A new numerical method of workspace overall solution was presented by analyzing sorting manipulator’〖KG-*2〗s kinematics. At the same time, the influence of master arm length, random arm length and workbench radius on workspace was researched. Then, the singularity posture of Delta parallel sorting manipulator was discussed by using Jacobian matrix. Based on the condition number of forward solution, an optimization method of mechanism dimension parameter was presented for reasonable structure.