Abstract: Freezing/ice blockage accident induced by hydrate happened during commissioning of SINOPEC YuJi Gas Pipeline, which led to the abnormal pressure changes in Xiyuanci Valve Chamber, Shimencun Valve Chamber and Yangjiayu Valve Chamber. Statistical analysis was made on running parameters from upstream and downstream pipeline and the bare pipe sections remained during the construction of the pipeline. Results showed that ice blockage of the pipeline was found at two bare pipe sections, in which, the 1st ice blockage was located at the upward pipeline between Xiyuanci Valve Chamber and Shimencun Valve Chamber, and 2nd ice blockage was located at the U-shape bending pipe section between Shimencun Valve Chamber and Yangjiayu Valve Chamber. Besides emergency disposal, effective measures, refilling alcohols inhibitors, venting, running under decreased pressure and heat tracing, were successfully taken to treat with the ice blockage accident.