Through laboratory tests of low liquid limit silt in Taizhou area, 2.6~2.9 and 3.1~3.4 modulus of water glass were used as modifiers, and the effect of improved silt in the area was researched. The results show that the maximum dry density of two kinds of water glass modified soil are less than the plain soil, and the optimum moisture content is also greater than the plain soil. The CBR values of the low liquid limit silt with two kinds of water glass in the area are significantly increased, and the compaction degree has effects on the CBR value of the modified filler soil. With the increase of the compaction degree, the CBR value shows different proportion of growth. And the growth rate with 28 days is much greater than the growth rate of 0 day. The early strength of the 3.1~3.4 modulus water glass improved soil is higher than that of the 2.6~2.9 modulus water glass improved soil. Under the same maintenance conditions, the improved soil strength of the 2.6~2.9 modulus water glass improved soil is greatly improved.