SIZE: 14pt">By using high-resolution laser grain size instrument Mastersizer 2000, the multimodal characteristics of grain size distribution of loess, desert, lake and river sediments are measured and carefully studied. The standard patterns and their grain size characteristics of various sediments are systemically summarized, the discrepancies of multimodal distribution among these sediments are concluded and the comparisons of grain size multimodal distribution of them are also discussed in this paper.