Based on the wind profile radar observation data of Suzhou in 2012, the four typical months (January, April, July and October) were selected to study the temporal-spatial distribution and intensity variation of planetary boundary low-level jet from the aspect of case analysis on low-level jet. Results show that the low-level jet occurred most in winter and spring and least in summer. The frequency of low-level jet increased after sunset, remained stable at night, then decreased after sunrise. 80% low-level jets occurred below 900 m height, and the mean height of occurrence was the lowest in summer and winter. More than 70% low-level jet amounted to 4-12 m·s^-1. The low-level jet smaller than 4 m·s^-1 and greater than 20 m·s^-1 rarely happened.