your ID: 0280 First Name: Yanli Last Name: Ai Affiliation: Yunnan Observatory, Chinese Academy of Sciences Title: The Optical Variability of Narrow Line Seyfert 1 Galaxies Authors: Yanli Ai Topic: 1 Session: poster Abstract: We will present our results of a search for the presence of optical variability in a sample of 164 Narrow Line Seyfert 1 Galaxies. These objects are a subset of the 2000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey(see astro-ph/0603759). We compare the photometric data between the SDSS DR4 and the DRSN1 to search for the variable objects.