The knowledge of the hyperfine structure of 139LaⅡ has been very poo r until now.In our experiment,the atomic hyperfine structure spectra of 139 LaⅡ with 5d2 1Ｇ4 and 4f5d 1F 3 configurations have been measured using collinear fast-ion-beam las er spectroscopy,and the magnetic dipole and electric quadrupole coupling constan ts were determined.