It is known that during the side and Angle adjustment of networks, it is necessary to do the variance components estimation to make the weights of observations rational.

Under a certain aim-mid precision, the error of short line Angle survey of the mini brim-angle net is bigger, so the production should be done the unequal precision mixable adjustment.

The situation in which it produces long side condition in triagulation net, trilateration net, triangulateration net and traverse is explained.