During the investigation of diatoms from Xingkai Lake,more than one hundred samples were collected and studied.Totally,7 taxa from Cymbellaceae and Gomphonemataceae were newly recorded in China.They are:Cymbella peraspera Krammer,Cymbopleura cuspidata (Kützing) Krammer,Encyonema obscurum var.alpina Krammer,Encyonema silesiacum var.lata Krammer,Gomphonema auritum Braun & Kützing,Gomphonema clava Reichardt and Gomphonema exilissimum (Grunow) Lange-Bertalot & Reichardt.The morphological characteristics of these taxa and comparison with similar species are given.The basis information of algae from Xingkai Lake is provided.