Compared with widely used in reinforcement foundation of saturated soft soil,cement soil pile has less application on improvement of enrichment pozzolana muck.The reaction mechanism among cement,soil and pozzolana is the determining factor whether cement soil pile can be used in improvement of enrichment pozzolana muck.Based on the study and analysis of hydration mechanism of cement-soil gelation system and cement-pozzolana gelation system,we obtain that strength contribution by pozzolanic effect is the key factor for strength growth of cement-soil-pozzolana gelation system in the later hydration period.Aiming at structural characteristic of enrichment pozzolana muck and hydration mechanism,we test cement soil pile based on appropriate cement-soil design parameter and construction technology.The results show that 28 days unconfined compressive strength is much better than the design strength,and the pile strength is much better than the ordinary cement soil pile strength in soft soil under the same conditions.It means that cement soil pile is suitable for improvement of enrichment pozzolana muck foundation.