TO precision products ,We must  Reasonable to design precision injection mould ,it's foundation and necessary premise.technology of precision injection moulding  is  the main and key production technology of electronic plastic parts  , and precision injection mould design is the importnt parts of precision injection production technology,   TO precision products ,We must  Reasonable to design precision injection mold ,it's foundation and necessary premise.Through design of reasonable to determine the size of the injection mould and  tolerance, to prevent injection products produce shrinkage , plastic deformation, release.deformation, overflow edge, etc., and ensure the accuracy of injection mould technical measures, and the correct  the precision injection moulding process for implementation ,applicable engineeri g plastic material and precision injection moulding equipment, so as to meet the best process effect.