In this article, adhering to the principles of advanced in technology, reliable in safety, economical in investment and practical in functions, the possibilities for reducing metro construction costs are analysed, and the following tentative suggestions for reducing metro construction costs are proposed：making fully preparations before constructing; paying great attention to passenger number forecast, so as to determine the scale of metro construction; taking increasing driving density of trains into consideration; choosing reasonable structural style and embedded depth of metro station; determining reasonable areas of the station rooms for equipment arrangement and operation management use; attaching great importance to the design of commutator stations; adopting reasonable distance between metro stations; making a choice between underground and elevated lines of metro in areas that, out of urban district; optimizing the embedded depth, structural dimension and its constructing schemes of metro tunnels; practically putting into effect the policies that metro equipments should be made in China not less than 70 per cent.