In this paper, the distribution and variation of light field with numbers of attracting fish lamp for squid were calcuated and its influence on the fishing performance of light pelagic trawl was analyzed. Then the lamplight intensity and overall arrangement were suitably equipped, the effective method of leading squid to pelagic trawl net was approached. The light pelagic trawl suited for deeper sea were designed based on the phototactic behavior of squid and the charateristic of pelagic trawl.An new flexible door for light pelagic trawl was successfully experimented. As a result, the better ecology and beneficial results were got.