As an important working procedure for anticorrosion of natural gas pipeline, corrosion prevention and repairing is the weakest link of the whole pipeline corrosion protection, which is very important to ensure the integrity of pipeline corrosion protection. As a new type of repairing technology in recent years, “two-component liquid solvent-free epoxy coating” anticorrosive repairing technology has been more and more applied in the repairing process of long distance gas pipeline. Because of Guangdong and Guangxi areas’ perennial high temperature, rainy and humid climate, the reasons of anticorrosive coating quality defects have some particularity,it is of great significance to study the quality control of liquid epoxy filling in pipeline. Based on Sinopec Guangxi gas pipeline project, some main quality problems of the liquid epoxy repairing are summarized by on-site inspection:appearance and adhesion which fail to meet the requirements, insufficient thickness, leakage point, etc. Through inductive analysis of the causes of quality problems, suggestions are put forward on how to improve the quality of repairing from monitoring of personnel, equipment and materials, monitoring of construction technology and process, monitoring of environment. Finally, through the implementation measures, the qualification rate is increased from 69% to 96%. By strengthening monitoring, the quality of anticorrosive patch has been greatly improved.