【Objective】 To investigate the relationship between effectiveness and periods of nutrition interventions about infants aged 6~24 months in Ningqiang county. 【Methods】 Infants were divided according to periods of nutrition interventions.And the differences of infants' weight-for-age Z-score(WAZ),height-for-age Z-score(HAZ),weight-for-height Z-score(WHZ)and hemoglobin concentration between groups were compared. 【Results】 The WAZ of 0~2.9 months group,3~5.9 months group and 6~8.9 months group were 0.37±1.25,0.07±0.97,0.07±1.02,respectively,and they increased significantly compared to the baseline(P<0.01).The WHZ of 0~2.9 months group,3~5.9 months group and 6~8.9 months group were 0.55±1.11,0.43±1.00,0.32±1.26,respectively,there were significant differences between intervention groups and non-intervention group.(P<0.01).The HAZ of 0~2.9 months group(P<0.01)and 6~8.9 months group(P<0.05) also increased significantly. 【Conclusions】 Through nutrition interventions the nutrition status of infants aged 6~24 months could be improved significantly.And there is a susceptive periods of nutrition interventions '0~9months'.