Abstract: The implosion experiment with double quads on SGⅢ facility was the first time laser indirect-drive implosion experiment, also the first time neutron experiment. The experiments used f1400 mm2100 mm hohlraum with f1000 mm LEH and f500 mm CH target with 1 MPa DD fuel, and the laser was injected the hohlraum by 55. The highest neutron yield was 9.7108, up to now, the highest indirect-drive DD neutron yield in domestic experiment. The experimental results show that the coupling efficiency of the hohlraum approximates 50%; the hohlraum is too long, and the pellet is compressed to a pancake; neutron yield is positively correlated with the laser energy; the Bang Time depends on the thickness of the ablative layer.