1. Wood cracking: wood is a natural material. Cracking is caused by various reasons such as different moisture content and wood ring, which is a normal phenomenon. As an anti-corrosion material, the purpose of preservative is to prevent corrosion, so that the wood can be placed in the harsh outdoor environment, which can resist termite erosion, the growth and decay of spore fungi, the boarding of aquatic organisms and the reproduction of other insects, and effectively prolong the use time of wood in the natural environment. The current anti-corrosion agents only have anti-corrosion properties and can not hinder the infiltration of water, so the wood will still crack.

2、木材變形：木材變形是由于內部應力造成的，木材開裂是由于木材表面的表面積發生變化造成的。造成這種變化的根本原因是因為木材的含水率發生了變化。由于木材是多年輪組成，而旋切的板材兩個表面的年輪的年齡是不相等的，形象地說：年齡大的一面對水分的反映慢，而年齡小的一面對水分的反映快。因此在同等條件下，年齡大的一面的表面積變化沒有年齡小的一面的表面積變化大。又因為木材沒有延展性，故面積縮小的一方只有通過開裂來增加表面積以保持平衡。所以我們說開裂與變形，與木材的含水率密切相關。

2. Wood deformation: wood deformation is caused by internal stress, and wood cracking is caused by the change of surface area of wood surface. The fundamental reason for this change is that the moisture content of wood has changed. Because the wood is composed of multi-year rings, and the age of the rings on the two surfaces of the rotary cut plate is not equal, it can be vividly said that the older one reflects the moisture slowly, while the younger one reflects the moisture quickly. Therefore, under the same conditions, the surface area of the older side does not change as much as that of the younger side. Because the wood has no ductility, the side with reduced area can only increase the surface area through cracking to maintain balance. Therefore, we say that cracking and deformation are closely related to the moisture content of wood.

3、運用于戶外的防腐木，開裂及變形受多種因素所造成。放置地點、日光照射、木質因雨淋等自然現象所形成的濕度等都是造成此類現象的原因。我們無法對這些自然的條件加以改變，因此目前沒有較好的維護方法，但可在施工過程中盡量加以控制。防腐木成品的最外部即表面是質量最可靠也是性能的一些部分，所以應盡可能減少對防腐木成品的打磨和剖面。

3. The cracking and deformation of anticorrosive wood used outdoors are caused by many factors. The reasons for this phenomenon are the place of placement, sunlight and the humidity of wood caused by natural phenomena such as rain. We cannot change these natural conditions, so there is no better maintenance method at present, but it can be controlled as much as possible during construction. The outermost surface of the finished anti-corrosion wood is the most reliable part of quality and performance, so the grinding and profile of the finished anti-corrosion wood should be reduced as much as possible.