Study on the change of soil quality ponds in farming Pacific white shrimp (Litopenaeus vannamei). Faculty of science and technology of shrimp pond fisheries, Trang, found that the average acidity - alkaline soil in the pond, and 1 2 The average 7.49, and 7.49 and values of organic matter in soil pond and the average 1 2 6.60% and 6.65% when analyzing the statistics. There is no significant difference (P < 0.05) than normal because of soil organic matter in soil is a reasonable level, only the 5% by weight. But is the element with the properties of soil physical, chemical and biological