【Objective】 To research the distribution features and related influencing factors of 12 months old children's temperament types in Kunshan region, provide evidence for early behavior intervention. 【Method】 Investigated 738 children aged 12 months by the Chinese Toddler Temperament Scale(CTTS) from routine health examination in Maternal and Child Health Bureau of Kunshan, and self-made questionnaire for the related factors of temperament was applied to survey the related factors. 【Results】 The constituent ratio of children's temperament types were Easy(5.69%), Intermediate-low(56.10%), Slow-to-warm-up(1.90%), intermediate-difficult(31.44%), difficult(4.88%). There was not significant difference in sex of temperament types. There was significant difference in activity level of temperament dimensions between boys and girls. There was significant difference in activity level, rhythmicity, taxis, adaptability, emotion essence, persistence, attention span and response threshold of temperament dimensions between the study and national norm. Mother's bearing age, education level, the time of watching TV during pregnancy, guardian, guardian's attitude, education level and character etc. factors influence children's temperament dimensions. The higher proportion of Easy were guardian with high degree, family with relative low month-earning. The higher proportion of Intermediate-low were father with high degree, without smoke or alcohol addiction and guardian with strictly attitude. The higher proportion of intermediate-difficult were low mother's bearing age, higher gestational age, cadres mother and artificial feeding. The higher proportion of difficult were higher mother's bearing age, mother often fear, low sleep and complications during pregnancy. The higher proportion of Slow-to-warm-up was father with smoke and alcohol addiction. 【Conclusions】 Most children in Kunshan temperament types are Easy and Intermediate-low. There is difference in active level between boys and girls. There is significant difference in part of temperament dimensions between study and national norm. Many synthetically factors affect the temperament of Kunshan children.