PROBLEM TO BE SOLVED: To provide a soil modification technique enabling easy execution, not requiring material clearance and maintenance after execution, and capable of efficiently removing salt in the soil. SOLUTION: A soil modification structure 20 provided with a pervious zone 21 is formed by a step of forming a plurality of grooves 11 on the soil 10 to be modified and placing a circular drain pipe 12 having a plurality of through-holes 12b on the circumferential wall 12a in each groove 11, and a step of backfilling the groove 11 after placing the drain pipe 12, scattering a modifying material 13 on the soil 10, thoroughly kneading the soil, leveling the surface 10a of the soil 10, and leaving at rest without change. The modifying material 13 includes an aggregation agent 14 in combination with a magnesium-based solidifying material 15 or slaked lime 16 (calcium hydroxide). COPYRIGHT: (C)2013,JPO&INPIT
