Abstract: Mycoplasma pneumoniae pneumonia (MPP) accounted for 10%-40% of pediatric community-acquired pneumonia. The clinical manifestations of MPP were complex and varied. In addition to pulmonary inflammation, , the complications with lungs and other organs had been widely reported in MPP. Although the MPP complicated with thrombus in lung, other organs and limbs was rare reported, it was serious and life threatening once thromboembolism happens,. Clinicians should pay great attention to improve the ability of early identification, diagnosis, and treatment. This paper will focus on the mechanism, early identification, early diagnosis and treatment of MPP complicated with thrombosis.