T&A has a favorable therapeutic effect on NE and may decrease SNA in children with OSAS. sAA might be associated with instability of ANS by OSAS and have a consistent relationship with the apnea-hypopnea index. Our studying aims had been met. (201KB)Figure. Levels of n-sAA and m-sAA at baseline and 1 year later in 4 groups. # P < 0.05, compared with Group A or B. * P < 0.05, compared with Group A,C or D.