The invention provides a method and system for arranging a line for a preliminary qualification test of a submarine cable system, and the method comprises the steps: arranging a place, and setting a seawater environment simulation pool, a tunnel, a snake-shaped laying region, an underground threading cable trench, a directly buried cable trench, and an arc-shaped bent cable trench; laying a submarine cable at the arranged place, and dividing the laid line into various laid segments according to the difference of operation environments and laying states; installing submarine cable accessories;and completing the burying and seawater simulation environment arrangement according to the laying requirements. The method and system can achieve the arrangement of the submarine cable line on the land, increase the seawater environment simulation segment, enable the arrange of the line for the preliminary qualification test of the submarine cable system to completely represent the conditions ofthe laying design in the submarine cable standard, can guarantee that the long-term performances of the submarine cable system are checked truly, effectively, scientifically and objectively through the preliminary qualification test.