Abstract: The atomization quality of a double line pressure-swirl atomizer for aero-engine was investigated using phase Doppler particle analyzer(PDPA).The spacial distributions of Sauter mean diameter(d₃₂) and the angle of spray cone were obtained.The results show that: the droplet size decreases with the increase of fuel-supplying pressure,and tends to become invariable when the pressure rises to certain extent;the spray cone angle is basically independent from fuel-supplying pressure;d₃₂ decreases with the widening distance from the spray nozzle,when the main or secondary fuel lines operates respectively;at the same measuring cross section,d₃₂ slightly changes with the radial distance.