Based on the deformation characteristics of the large gear ring machine processing and the deformation laws at each stage of processing, reasonable processing techniques can be formulated and selected; whether using step-by-step clamping processing or pre-stressed processing, it is first essential to ensure a minimal finishing allowance to minimize the deformation of the small gear ring during finishing; rough machining on the gear milling machine can control the finishing allowance at a smaller size; full pre-stressed processing is a more economical and reasonable method.