Abstract: Objective To investigate the application of somatosensory evoked potential stim-ulator in cancerous pain nursing assessment of cancer patients.Methods Selected 102 cancerous pain patients from 2013 June to 2014 March in our hospital oncology,Respectively by using visual analogue scale (VAS)and somatosensory evoked potential stimulator to assess Cancerous pain,and given other routine nursing care.The results of two assessment tools and their correlation were ob-served.Results The average pain degree evaluated by somatosensory evoked potential stimulator was 1.55±0.83,the average VAS was 1.67±0.71,By correlation analysis,there was a signifi-cant positive correlation between the two (r =0.823,P <0.001).Conclusions Somatosensory e-voked potential stimulator has good correlation with VAS in cancerous pain assessment,can be used in the clinical assessment of cancer pain degree and the judgment of efficacy of treatment.