Objective To develop the Nasointestinal Tube Enteral Nutrition Care Ability Assessment Scale for Caregivers of Gastric Cancer Patient，and to test its reliability and validity. Methods According to the caregiver skill model，the initial scale was drafted by combining literature research，semi-structured interview，expert letter consultation and pre-survey. From April 2022 to September 2022，convenience sampling of 442 caregivers of gastric cancer patients after surgery in three grade III，class A hospitals in Xi’an were recruited as participants. Questionnaire survey was conducted for item analysis and reliability and validity test. Results The final version of the scale included 35 items in five dimensions，including caregiver cognition，caregiver quality，caregiver skills，caregiver emotion management，interpersonal relationship and resource utilization. The item content validity index was 0.81~1.00 and the scale-level content validity index was 0.93. The total Cronbach’s α coefficient of the scale was 0.932. Conclusion The reliability and validity of the Nasointestinal Tube Enteral Nutrition Care Ability Assessment Scale for Caregivers of Gastric Cancer Patient is satisfied，which can provide reference for evaluating the ability of caregivers of gastric cancer to care for nasointestinal tube enteral nutrition.