Preservative-treated wood is produced by utilizing the principle of pressure impregnation. The standardized wood is placed in a pressure vessel, where it is infused with wood preservative. Through vacuum pressure, the preservative is driven deep into the inner layers of the wood. The excess preservative is then vacuum-pumped out, leaving the wood to dry. It boasts superior preservative properties, effectively protecting the wood for a prolonged period and extending its service life.