Objective To develop a precancerous lesion of atrophic gastritis patient reported outcome （PRO） scale （PLAG-PRO） and analyze its reliability and validity. Methods The scale was developed by establishing item pool through literature retrieval

Delphi method and pre-investigation

and selecting and optimizing items. Preliminary investigation was conducted in Shaanxi province

and the data of 204 valid respondents was used to assess the reliability and validity. The reliability was measured by internal consistency Cronbach’s α coefficient and split-half coefficient. The discriminate validity and constructive validity were assessed by T test and exploratory factor analysis and confirmatory factor analysis respectively. Results The PLAG-PRO scale with 3 field and 30-item in it was developed. Its Cronbach’s α coefficient was 0.892

split-half coefficient 0.715

and all items reached the reservation standard of T test （P<0.05）. Five factors were selected from the 30 ones by factor analysis

which contributed to 52.372% of total variance. Goodness of fit index （GFI） of the scale was 0.954 and that of the physiological field

psychological field

and social field was 0.962

0.905

and 0.903 respectively. Conclusion The result shows that the scale has good reliability and validity. It can be applied for therapeutic evaluation of PLAG.