The soil were divided into five groups of soil, e, g, light clay, heavy loam, medium loam, light loam and sandy soil, using the group of soil texture of plowed layer as the mapping unit.

In offshore soils there exists widely a kind of soil which mainly consists of silt and sand except clay with low plasticity.

The invention has the advantages of high efficiency, energy saving, thermal insulation, no need of timber and clay, light weight and no discharge of three wastes in the production process.