The water conservation capacity of different vegetation types are studied in the sandy sea coastal areas.The results show the follows: there are significant differences between the soil physical properties and the water conservation capacities among vegetation types.The mixed forests have higher water conservation capacity and better soil physical property improving.The total water-holding capacities of the mixed Pinus thunbergii and Amorpha fruitcosa forest,the mixed Pinus thunbergii and Robinia pseudoacacia forest,the mixed Pinus thunbergii and Quercus acutissima forest,the pure Pinus thunbergii forest and Meadow are 1 973.97 t/hm~2,1 760.95 t/hm~2,1 727.44 t/hm~2,1 638.60 t/hm~2 and 1 413.04 t/hm~2 respectively.Among them,the water-holding capacities of soil take up more than 97% of the total,while that of the litter are 15.3 t/hm~2,22.15 t/hm~2,43.42 t/hm~2,11.27 t/hm~2 and 9.4 t/hm~2 respectively.Therefore the mixed forest of arbor and shrub should be cultivated in the region in plantation practice in the future.