Sediment quality dynamic studied in pacific white shrimp ( Litopenaeus vannamei ) pond. at Faculty of Secience and Fishery Techology, Rajamangala University of Technology Srivijaya, Trang Campus. The result shown average pH of sediment was 7.49 in both pond No.1 and 2. An average of organic matter in pond No.1 and 2 were 6.60 % and 6.65 % respectively. An average organic matter among was no significant (P>0.05). organic matter in sediment was 5 % ponds. Sediment however, organic matter play role important to physical, chemistry and biological of sediment, Organic matter decompose to continved by microorganism.