Objective To assess of fitness in preschool obese children,and to provide the basis for making the individualized exercise prescription. Method Questionnaire method and standardized testing were used to acquire the children's daily physical activity and fitness level. Results The average daily sleep,meditation,activity time and activity intensity were got.The statistical analysis found that obese children in preschool average daily meditation for a long time,activity time was short,and activity intensity was low.Boys were all failure and only 16 percent of girls qualified.Physical individual indicators,obese boys,sit-and-reach,tennis throw away,continuous feet jump,shuttle run,standing long jump,walk the balance beam,passing rates were 28.6%,4.8%,4.8%,11.9%,7.1%,0%.Obese girls sit-and-reach,tennis throw away,continuous feet jump,shuttle run,standing long jump,walk the balance beam passing rate was respectively 24%,28%,16%,8%,16%,8%.Conclusion Obese children with low levels of daily physical activity,physical fitness is poor,personalized,targeted exercise training for them is necessary.