According to the modern condensed polymers physics the polymer solutions can be divided in 5 classes according to concentration: extremely dilute solution; dilute solution; semi-dilute solution; concentrated solution and highly concentrated solution. There are 4 dividing concentrations between these solutions: dynamic overlap concentration; overlap concentration; entanglement concentration and full Gaussian concentration. The last one was nominated by author. The definitions and physical meanings of these dividing concentrations were introduced in this work

and the reason for naming of full Gaussian concentration was explained in particular. Also the essences and microscopic images of macromolecular chains conformations

of the correlative effects between segments in these solutions with different concentrations were discussed in detail. By the way the influences of the concentrations on the solution properties were discussed simply.