We briefly reviewed the history and status of the IVS (International VLBI Service for Astrometry and Geodesy) Intensive observations, and investigated the deficiencies and the error sources in the current Intensive observations. We carried out an in-depth analysis of the IVS Intensive data from February 1984 to August 2011 with different observation networks, and discussed the progress of the UT1 accuracy determined during this period. By comparing with UT1 results from different networks, we have found the difference with some dozens of microseconds between different networks. The results from the IVS Intensive observations with Seshan station showed the similar performance as other stations. Finally, from the comparison and analysis of different UT1 series, we concluded that there is an uncertainty with a level of 10 microseconds between UT1 estimations obtained from the IVS Intensive observations and from the IERS (International Earth Rotation Service) C04.%首先对IVS (International VLBI Service for Astrometry and Geodesy) UT1加强观测的历史发展和总体情况进行了比较详细的介绍,对目前加强观测中存在的问题进行了比较全面的分析；在此基础上对IVS从1984年2月到2011年8月全部的加强观测数据进行了综合处理,进一步分析了加强观测解算UT1的历史改进和目前的解算能力,对比分析不同类型加强观测的UT1结果,发现不同观测网之间存在数十微秒水平的差异；并着重分析了上海佘山站参与的加强观测的解算结果,分析表明上海佘山站在IVS加强观测中与其他参与台站具有相同的测量能力.总体而言,目前IVS加强观测确定的UT1与IERS (International Earth Rotaion Service) C04之间存在约10 μs水平的不确定性.
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