We investegated 133 diatom taxa (including 122 species, 11 varieties) from Lalu Wetland, of these taxa, 6 species were new record in China: Eunotia dorofeyukae LangeBertalot & E. Reichardt, Gomphonema calcifugumm LangeBertalot & E. Reichardt, Gomphonema campodunense E. Reichardt, Navicula trilatera Bahls, Cymbopleura similiformisKrammer, Cymbella langebertalotii Krammer. We analyzed the species composition of diatom, pointed out the advantages of genera and species, and analyzed environmental indicator of advantage of species.