It had poor effect to reinforce heavy clay recently reclaimed soil with routine vacuum preloading and surcharge preloading in Dalian port. The straight-line vacuum preloading method was adopted to carry on the laboratory model test for finding a solution. The result was that the drain spacing played a leading role to reinforce heavy clay recently reclaimed soil by straight-line vacuum preloading, through indoor comparison test and comprehensive analysis on different drainage materials and different drain spacings.