Abstract: Free spans on subsea pipelines are spans of the pipeline unsupported by the seabed and pipelines with long free spans are subject to increased fatigue loads and reduced pipeline integrity. Free spans corrected by cement grouting have been used for many years in international engineering projects, but there are few applications in China. Sand bags are still used very commonly in domestic projects. However, most projects corrected by cement grouting are low spans, since this method is not suitable for high span correction in technology and operation. For the high and big spans, a permanent solution is needed. Based on the common grouting correction procedure, through the technology improvement and design optimization, we make it meet the requirements of large span correction. Through the practice of LW3-1 project, we introduce the method of grouting, analyze the characteristics and advantages, point out the way for its development and provide a guideline for the large span correction.