The radial distribution functions, spatial distributions and the particle number distribution of local main stress in amorphous at each pressure are calculated.

Radial distribution functions of na - o, o - o and H-O analysis illustrate that the molecular structure of interlayer water is different from the bulk solution.

The molecular dynamic data of compressibility factor are used to regress this two localized radial distribution functions. Therefore, a new equation of state of square well fluids is established.