Abstract: In this paper some problems in optimum design of engineering surveying control nets are studied:1.Optimization of net form All control points are divided into two kinds.The second kind of points which has certain ranges of selection is selected by the optimum seeking method.2.Optimum coordination between the precision of observations of sides and angles.The optimum coordination is discussed separately for the case of triangulation-trilateration net,triangulation net with observing some sides and trilateration net with observing some directions(or angles).3.Optimization of the distribution of observation weights.This problem is solved by seeking the optimum proportion of weights distribution.