As comparing with the ITRF2000, the ITRF2005 make a lot of improvement on solution generation, datum definition and realization and so on, so there is a certain frame difference between the ITRF2000 and ITRF2005, furthermore, it would affect GNSS data processing. So in this work, the differences of the results including station coordinates, baseline length and horizontal velocity field were analyzed. After transformation, the differences of position are at millimeter level, the differences of baseline length are less than 1mm. The differences of horizontal velocity fields decreases with the reduction of studied area. For large regions, the differences are less than 1mm/a and a systematic difference of about 2 degrees in direction. For medium regions, the differences and direction are not significant.%分析ITRF2000和ITRF2005下得到的测站坐标、基线长度、水平速度场的差异.结果表明:经过坐标转换后,测站坐标差异为毫米级,基线差异在1 mm以内；ITRF2000和ITRF2005下水平速度场的差异随研究范围的缩小而减小,大尺度区域的水平速度场差值在1 mm/a以内,方向上存在2°左右的系统差,而对于中等尺度区域,该差异在数值和方向上均不显著.
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