In order to explore the mixed-species flocks’composition and role of the wintering bird and find out some basic rule of the mixed-species flocks in Coastal Wetland in Guangxi, we selected fixed 3 deep water shrimp ponds and 3 shallow ponds in the coastal area of Fangchenggang city. 80 times Fixed-point observation were carried out in the above two types shrimp pond from December of 2013 to February of 2014, respecetivly.The time of initiation, duration, species, individuals, the times of individual behaviour in mixed-species flocks including vigilance, rest,forging at high frequency in samll area and forging in large area were recorded. We used the regression analysis to test the relationship between flock size and the number of species. Variation of the frequency of occurrence between two types shrimp pond was examined with chi-square analysis. Differences of the species and individuals between two types shrimp pond were analyzed with two-sample t-tests. The table 1 showed that 11 species distributed in each type shrimp pond. The major members of deep water shrimp pond were the medium-sized individuals of Spotted Redshank，Common Greenshank and Marsh Sandpiper. They were the small-sized individuals of Little Ringed Plover and Temminck’s Stint in shallow water shrimp pond. The deep water shrimp pond’s flocks averaged 5.48±1.60 species and 18.75±11.67 individuals. They averaged 3.93±1.14 species and 11.65±5.12 individuals in shallow pond. The nuclear species of Spotted Redshank and follower species of Common Greenshank and Marsh Sandpiper became the joiner species from the deep water shrimp pond to shallow pond. However，the nuclear species of Little Ringed Plover and follower species of Temminck’s Stint became the joiner species from the shallow water shrimp pond to deep pond. The results indicated the obvious differences existed in the composition and role of mixed-species flocks in different types of habitat. The differences among habitats were probably the result of many factors including species composition，the distribution of resources，and other factors.