Deep cement mixing pile is a common method for reinforcing soft foundations.It has been used on land in China and a perfect quality evaluation system has been established.In recent years，China's water transportation engineering has developed towards large-scale，deep-water and high-quality development，and the underwater DCM technology has been successfully applied to multiple major projects.Due to the significant differences in equipment，technology，and environmental conditions between underwater and land construction using DCM methods，directly applying land-based evaluation methods to underwater operations may not be effective.This paper compares and analyzes the relevant regulations on DCM quality evaluation in China，Japan，the United States and Europe，the results show that when the detection quantity of underwater DCM is large，the data follows a normal distribution，Japanese standards can be used for evaluation.The minimum average strength is used as the representative value of pile strength in the domestic JGJ 340—2015 Technical Code for Testing of Building Foundation.However，due to the large diameter of underwater DCM piles，the testing samples are relatively small and the statistical significance is not obvious，so it is not suitable for evaluating the quality of underwater DCM composite foundation.