According to the classification of tree species, there are Pinus sylvestris var. mongolica. Pinus sylvestris var. mongolica, Pinus sylvestris var. mongolica, Pinus radiata and Hemlock. According to the anti-corrosion treatment agents, there are chromated copper arsenate anti-corrosion wood, ACQ anti-corrosion wood, copper azole anti-corrosion wood, boron compound anti-corrosion wood and so on. According to the details of tree materials, hardwood pine/Mongolian pine. Commonly used are Pinus mongolica (Russian Pinus densiflora), Pinus australis, Hemlock (USA), Pinus contortus (Canada), Pinus densiflora (Finland, Sweden) and Pinus radiata (New Zealand). Except for Russia, which is a natural mature forest (70- 100), the rest of the wood is mostly artificial fast-growing forest. In general load-bearing wood structures, the rapid growth of artificial fast-growing forests leads to the widening of growth rings, the decrease of heartwood, the decrease of density, the looseness of materials, the lack of toughness and the great variability. Bridges, wooden houses, seawater and underground structural piles should be avoided and used less. At present, the most common and cheapest product on the market is Pinus sylvestris var. mongolica. Mongolian kapok. Buy anticorrosive wood, try to choose products with trademarks or industry brands, and don't just look at the price. At present, the products of domestic regular anti-corrosion wood enterprises can basically meet the quality standards. A regular anticorrosive wood enterprise refers to a legal business license, a fixed site and contact address, a certain scale of production and sales, and a standardized trademark for its products. Good quality anticorrosive wood needs a certain cost. If the price is lower than the market price of the same wood material, it is basically non-standard production of anticorrosive wood. Preservative wood includes: Canadian red cedar, American southern pine and European red pine. Mongolian wood, Finnish wood (Korean pine), Canadian hemlock, pineapple, etc.