Laboratory tests are carried out to study the influences of clay content and equivalent pore size on the drainage behavior of soil-filled geotextile bag in Lianyungang harbor.Results show that the drainage effect and water content of soil-filled bag change nonlinearly with time.The drainage rate is up to thousands %d at initial phase,and then decreases rapidly to dozens %d,and becomes less than 10%d after 1 day.The maximum drainage rate is greater with less clay content.The drainage behavior is greatly influenced by the clay content of filled soil and equivalent pore size of geotextile bag.For the construction of embankment with soil-filled geotextile bags in Lianyungang harbor,the clay content of filled soil shall be controlled under 20% and the equivalent pore size of geotextile bag shall be about 0.15 mm.