Based on the peat soil treatment project of cement mixing piles in the inner yard of a wharf on the east coast of Malaysia，we carry out the indoor mixing ratio test of cement pile，the final hole parameter analysis of the test pile，and the engineering efficiency analysis of test pile.Meanwhile，we systematically study the strength change and treatment effect of cement mixing pile composite foundation under various mixing ratios.The results show that due to the different soil layer distribution and engineering properties of the two test pile sites，the 28-day core unconfined compressive strength (UCS) of test pile site 1 is generally high with large strength surplus under the ratios of 16%，18%，and 20%.At test pile point 2，the strength at 7-9 m is lower than that at other depths when 18%，20%，and 22% are adopted，and thus 18% cement content is recommended.The surface humic soil section adopts other strengthening measures or excavation and replacement processes to ensure the construction quality.Finally，the utilization of cement mixing piles to strengthen the peat soil can yield good results.