In order to measure the laser beam-divergence on-line during the laser manufacture, a divergence angle measurement system for pulse laser is established. It is based on the focus method. The laser beam widths are measured by using variable aperture method. In order to improve its automation, a test software is built based on LabView software. It will realize automatic measurement with different diameter apertures, record the relevant energy, compute the dirergence angle of laser, save and type the results. Experimental results show that the error of this measurement system is below 0.05 mrad which can fulfill the requirements of divergence angle test.