【Objective】 To learn the situation of 1~3 years old toddlers' social-emotional development and analysis the influencing factors. 【Method】 The number of 1 252 toddlers' mother was investigated by using socio demographic questionnaire and Chinese Evaluation of Social-emotion of infants(CITSEA measure table) with method of random sampling. 【Results】 1)In the number of 1 252 toddlers, the abnormal detectable rate of the four dimensions, include externalizing, internalizing, deregulation and competence were 11.90%, 7.4%, 11.9% and 8.8%. The constituent ratio difference was observed between Shenzhen and 14 cities in China. 2)The age difference observed in competence dimension and compulsive behavior, sensory Sensitivity, attention and so on. 3)The girls' externalizing behavior was lower than boy, but their internalizing behavior and competence higher than boys. The gender difference also was observed in externalizing, internalizing and competence dimensions. 4)Parents age, education level, mainly by raising children and whether only-child children were all relevant to toddler's social-emotional development. 【Conclusion】 Toddlers' social development has its distinctive features in Shenzhen, Parents good behavior way, comprehensive qualities, raising mode and parent-child interaction relationship were all important factors for promoting toddlers' social-emotional development.