Abstract: 　Objective　To investigate the clinical features of a patient diagnosed with Jacobsen syndrome (JBS) and ParisTrousseau syndrome (PTS) using chromosomal microarray analysis. Method　A retrospective analysis including the patients’ clinical manifestations, laboratory examination and genetic analysis was carried out and related literature were reviewed. Results A 14 month-old girl with global development retardation was reported. The patient can sit but cannot walk independently. The patient also presented hypsicephaly, ocular hypertelorism, palpebral ptosis, flat nasal bridge, sparse eyebrows, and speech delay. Gesell development scale showed that the patient was global development retarded with a development level of 40 weeks. No o bvious abnormality was found in EEG but the MRI showed cerebral white matter abnormality. This patient was also diagnosed with neonatal thrombocytopenia in other hospital. Genomic CNVs were detected in this girl, and a 15.7Mb loss was found in the 11q23.3q25 region that covers JBS and PTS region. Conclusions　Patient diagnosed with JBS and PTS often present with craniofacial abnormalities, cerebral white matter abnormality and neonatal thrombocytopenia. Chromosomal microarray analysis can help diagnosis.