The Cosmology Effect of Dust

Based on the discovery of an IR background in the waveband 2-5μm and pregalactic stars, we discuss the effect of the 3K cosmic microwave background spectrum from dusts of various models.The results show,if the neutral hydrogen content is very low(that is,no lyman cut-off), the reradiation from dust must produce a temperature distortion 0.1-0.2K near the peak frequence of the 3K cosmic microwave background and does not depend on the dust models. On otherwise, if neutral hydrogen content is very high, the refadiation from dust produces no effect on the 3K cosmic microwave background.