For left-behind children in adolescence，a long period of separation between parents and children，incomplete family structure and unbalanced physical and mental development during adolescence are prone to various emotional problems when faced with school bullied .If the victims of bullied can get positive help and support from school，family and society，then their emotional problems may be effectively alleviated .Based on previous studies，it is found that left-behind children and non-left-behind children have many different conclusions on the interaction between bullied，anxiety and social support，but few dynamic longitudinal comparative studies have been conducted.
In this paper，children in a school in Anhui Province were longitudinally-tracked three times for five years at three time points in 2015(T1),2017(T2) and 2019(T3). A total of 951 pieces of effective data were collected from the three surveys，including 299 left一behind children and 652 non-left-behind children .This paper is a single study including three sub-studies .study a: SPSS was used to analyze the data，and the overall situation of bullied and anxiety of left一behind children and non-left-behind children，the differences in demographic variables and the change trend over time were discussed from the horizontal and vertical perspectives .study b: Using R language and Mplus to conduct cross-hysteretic analysis of the data，to explore the interaction between bullied and anxiety over time .study c: Mplus was used to analyze the data and investigate the mechanism of social support between bullied and anxiety in left一behind children and non-left-behind children，and a cross-lag mediation model was established.
The main findings of this paper are as follows: Study a:bullied of left一behind children and non一left一behind children has an overall decreasing trend over time，while anxiety has an overall increasing trend over time .The bullied and anxiety of left一behind children and non一left一behind children have significant differences in the detection rate，gender，grade ,household registration type，and main caregivers of different educational levels at a certain point in time .Study b:Both left一behind children and non一left一behind children had only a one一way predictor of bullied and anxiety .Study c:Left一behind children’s social support plays a partial mediating role in bullied and anxiety.
Based on the above research results，the following conclusions can be drawn: the bullied of left-behind children and non一left一behind children decreases with age，and the anxiety increases with age .The bullied and anxiety of left一behind children and non-left-behind children are different in a certain time point and dimension. Early bullied of left一behind children and non-left-behind children can lead to more anxiety later on .bullied in the early years of left一behind children can affect their later anxiety through social support;However，bullied in the early years of non一left 一behind children can not affect their later anxiety through social support.
This paper has obtained some valuable research results，enriched the longitudinal study of bullied and anxiety in school and left一behind children，provided theoretical guidance for the intervention and prevention of bullied in school，and provided feasible basis for the relief of anxiety and care for left-behind children. In addition，there are still some deficiencies in this study，which also provides a referential direction for further research in related fields.
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