The corrosion rate of the steel big difference. If the temporary maximum corrosion rate to 6 ~ 8g / over into an exceptionally strong corrosion at 4 ~ 7g / division in the division moderate corrosion 2 ~ 4g / in 2g / below or weak corrosion, the exceptionally strong In addition to crimson soil corrosive soil and South Station in Shenzhen, the rest are desert soils. Soil types, including soil erosion intensity are more, the red soil, crimson soil, the coastal saline soil, soil, yellow brown. Soil, cinnamon and some brown desert soil, belonged to this level, moderately corrosive soils, including a variety of soil, red limestone soil and loess oasis. Weak corrosive soil, although mostly with various types of saline soil salinization, but also includes a gray damp soil. Brown desert soil and sierozem. Outside ash calcium soil, the soil is a common feature of such extreme values ??are in the water, not the water saturation is very dry. So in the soil water status under our usual, mostly belonging strong corrosion and corrosion hungry middle range. The maximum erosion rates tend to occur in the first year, after declining trend, indicating the importance of early corrosion.