The present paper deals with formation and reelamation of tile-like crust-solonetz in semi-arid region of China.Main characteristics of tile-like crust-solonetz are given as follows:1.There are no plant except alkali tolerant plants on this soil.2.On the surface of this soil,there are tile-like crusts of 1-2 cm in depth ;and on the crust back,there are spongy structures.3.Total salt content of the soil is sot so high in all the profile,that of the surface soil is less than 0.5% and that of the subsoil is about 0.1%.Sodium carbonate and sodium bicarbonate are predominant in salt composition The pH of the entire soil profile is above 9 and ESP is higher thaw 20%.Soil survey and the modelling test in the laboratory has proved that there are two different ways by which the crest-solonetz is formed.Firstly,in the process of alternation of accumulation and desalination,the sodium ions enter the soil adsorptive complex in the salt-affected foil containing sodium salt.Secondly,the soil is alkalized with the accumulation of sodium-carbonate and bicarbonate in soil induced by the rising of the lowly mineralized ground water.