[en] Requirements for the accuracy of geodesic measurements at various stages of constructing charged particle accelerators have been formulated. Introduced is a conception of a frequency characteristic of a magnetic system - a function, expressing a particle orbit sensitivity to electromagnet foundation deformations. A technique is stated and results of calculation of frequency characteristics for ITEP and IFVE proton synchrotrons are given. Requirements for circular accelerator foundation have been determined. A technique of foundation calculation and designing is described. Discussed are the methods of the results analysis and the necessary accuracy of geodesic measurements carried out after completing the mounting. A simple criterion for tentative evaluation of the measurement results is suggested