Objective To reassess the reliability of the School-age Children′s Eating Behavior Scale developed by the research group by the generalizability theory,and then to revise the original scale. Methods Totally 700 parents of children aged 6 to 12 years were randomly selected from two primary schools in urban and suburb of Xi′an from March to June 2018,and were asked to filled out School-age Children′s Eating Behavior Scale.Then the scale was evaluated and revised based on generalizability theory. Results The generalized coefficients of the 8 dimensions were 0.74-0.85,and the reliability indexes were 0.73-0.84,which were greater than 0.70 and reaching the good level.The performance of dimensions of ill-balanced eating,food responsiveness,satiety responsiveness,craving for junk food were relatively good,while those of worse eating habit,external factor eating,dietary restriction,food preference were relatively worse.According to experts and GT analysis results,the final revision scale,including 46 items and 8 dimensions,had good reliability and validity. Conclusions The School-age Children′s Eating Behavior Scale revised and improved based on the generalizability theory,is prove to be of good test accuracy and reliability.Therefore,it could be used to measure and evaluate the eating behaviors of school-age children in China.