ObjectiveTo assess the value of portable sleep monitor in the diagnosis of obstructive sleep apnea syndrome (OSAHS) in children.Methods58 children with snoring as chief complaint were included in our study. They were divided into group of 3-5 years old (n=28) and that of 6-14 years old (n=30). All children underwent sleep monitoring with both portable sleep monitor and polysomnography (PSG)．The results obtained by both methods were compared and their correlations were analyzed.ResultsIn the group of 3-5 years old, primary snoring was diagnosed in 15 children by PSG, one of them was diagnosed as OASHS by PM. Also in this group, one with severe OSAHS diagnosed by PSG was diagnosed as moderate OASHS by PM. In the group of 6-14 years old, 15 children were diagnosed with primary snoring, which was accordance with PSG. One with moderate OSAHS by PSG was diagnosed as mild by PM. Taking PSG results as standard, the sensitivity, specificity, and accuracy of PM for the diagnosis of OASHS in the group of 3-5 years old were 100%, 93.75%, and 96.55% respectively. The data obtained by PM were accordance with those by PSG in the group of 6-14 years old.ConclusionWith good parameter correlations with PSG and convenience for operation, PM has high clinical diagnostic value for OSAHS in children, and is therefore worth of popularizing.