Color fastness is a very important indicator to evaluate the quality of textiles. At present, color fastness is tested mainly according to China National Standard (GB/T series) and American Association of Textile Chemists and Colorists (AATCC series). Different standards give different quality results for the same sample. The paper mainly compared the differences of color fastness to water, perspiration and rubbing between GB/T series and AATCC series. Color fastness to water tested according to GB/T5713-1997 was different from AATCC107-2007 in sample size, liner fabric, and time for keeping constant temperature with 4h and 18h, respectively. The differences of color fastness to perspiration of GB/T3922-1995 and AATCC15-2007 were sample size, liner fabric, component and pH value of perspiration, liquor ratio and time for keeping constant temperature. Of which pH value of perspiration showed remarkable difference, GB/T3922-1995 specified two kinds of perspiration with pH value 5.5 and 8.0，while AATCC15-2007 specified pH value with 4.3. Color fastness to crocking stands of GB/T3920-2008 and AATCC8-2007 had little difference, mainly in the moisture of rubbing fabric.