Abstract: The design of control network and the accuracy of results are the basis of engineering construc-tion. For large and medium-sized projects, it is necessary to optimize the design of construction controlnetwork, deformation monitoring network and installation control network. Based on the quality criterionof control network, this paper designs a complete set of calculation program. Through the case analysis.the results before and after the optimization of control network are compared with COSA software, andboth of them are consistent, no matter the point accuracy or the weakest edge accuracy; at the sametime , the reliability index is added in this program compared with COSA, and the optimization results aremore comprehensive. The program in this paper has more advantages in use, such as more convenient pa-rameter adjustment, less human intervention, no need of manual calculation, especially more conven-ience for the increase and decrease of control points, direction and side length. According to the comparison with COSA, the accuracy and reliability of the calculation results of this program are explained.

Key words:  , control network；optimization；accuracy；reliability