Design optimization of any machine aims to reduce failures due to process tolerances. Computer Simulation and Computer designing are used to access the fitness of a design for mass production. Computer Model simulates the behavior of machining parts from geometrical and material parameter of the input parameters to output parameters. The emphasis of this work is on the des ign of machine components of Pneumatic Injection Moulding Machine. In this study the various components of machines are designed using Pro - E.This machine is used to mould Plastic into usable form and shape and most effective for small scale industries wher e small size plastic components are to be manufactured. https://www.ijiert.org/paper-details?paper_id=140261