Objective:To investigate the changes of inflammatory factors and immune function in bronchial asthma children with Mycoplasma pneumoniae infection.Methods:From March 2019 to March 2020, 78 children with bronchial asthma and Mycoplasma pneumoniae infection in Wenling Maternal and Child Health Hospital were selected as observation group, and 50 bronchial asthma children without Mycoplasma pneumoniae infection during the same period were selected as control group.The levels of inflammatory factors, including tumor necrosis factor-α(TNF-α), interleukin-8(IL-8) and interleukin-13(IL-13), immunoglobulin A(IgA), immunoglobulin G(IgG) and immunoglobulin M(IgM) were measured by enzyme-linked immunosorbent assay, and the changes of T lymphocyte subsets in peripheral blood were measured by flow cytometry.Results:The serum levels of TNF-α[(76.42±16.51)ng/L], IL-8 [(130.92±25.45)ng/L] and IL-13 [(172.35±28.39)ng/L] in the observation group were higher than those in the control group [(58.93±13.24)ng/L, (89.65±17.42)ng/L and (108.47±21.42)ng/L] ( t=6.708, 11.025, 14.665, all P<0.05). The serum levels of IgA [(0.64±0.16)g/L] and IgG [(7.31±1.26)g/L] in the observation group were lower than those in the control group [(1.04±0.19)g/L and (8.64±1.35)g/L], while the serum level of IgM [(1.29±0.24)g/L] was higher than that in the control group [(0.97±0.18)g/L] ( t=12.587, 5.864, 8.714, all P<0.05). The CD 3+ [(62.08±3.87)%], CD 4+ [(38.98±3.31)%] and CD 4+ /CD 8+ (1.29±0.13) in the observation group were lower than those in the control group [(71.38±4.35)%, (45.37±3.18)% and (1.87±0.25)] ( t=12.549, 11.103, 15.512, all P<0.05). Conclusion:Children with bronchial asthma and Mycoplasma pneumoniae infection have obvious inflammatory reaction and low immune function.