Inthispaper,thestabilityofaconcavesphericalstembulkheadunderthepumpingloadwhenstilllyingattheslipwayisanalyzed.Thestabilityofthesphericalstembulkheadwithdifferentshellthicknessandreinforcingformsisdiscussed.Accordingtotheresultsofstabilityanalysis,theoptimizationdesignofthesphericalstembulkheadstabilityisperformed.Onthebasisofconsideringthemachiningtechnicalrequirementsofthebulkhead,arationaldesignofthesphericalstembulkheadstructureisobtained.Thispaperhasacertainvaluetothedesignofsubmarine'ssphericalstembulkhead.