The Yangpu Peninsula salt fields in Danzhou City, Hainan Province, are more than 750 mu in area and are an important local sea salt production area. There are more than 7,300 large and small salt drying stone troughs, some of which have existed for more than a thousand years. The traditional salt drying process used in the Yangpu Salt Field is the board drying method, which has a history of more than a thousand years. The process is to first allow the seawater at high tide to flood the seawater storage pool to soak the mud and sand in the salt drying mud land (salt field). After the tide recedes, the mud and sand that have been flooded by the seawater are raked and exposed to the sun for two or three days. After the mud and sand are dry, dry straw is laid on it and rammed into the piled filter pool (salt mud pool). Then the water in the seawater storage pool is poured into the filter pool to soak the mud and sand in the pool. After the seawater slowly seeps to the bottom of the salt mud pool, it flows through the stone cracks into the brine pool below the ground next to it. The next morning, when the brine in the pool accumulates to a certain amount and settles and clarifies, it is directly poured into the stone trough. After being exposed to the sun for most of the day, it can crystallize into salt in the afternoon. Yangpu Salt Field is the best-preserved ancient salt field in China. The traditional salt-drying technique still used here is a precious historical and cultural heritage left over from the development of my country's salt-making industry. Salt-drying is an ancient technique that is closely related to people's daily life and production labor. The sea salt-drying technique uses seawater as the basic raw material, and uses the beach mud and its salty mud (or artificially made mixed ash soil), combined with sunlight and wind evaporation, to make brine through manual labor such as pouring and splashing, and then through fire frying or sun drying, wind blowing and other methods, the brine is naturally crystallized into raw salt. The entire drying process has more than a dozen steps, which are purely manual operations, and contains rich production technology experience. (No pictures yet, welcome to provide.) (No pictures yet, welcome to provide.)