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To improve the fire suppressing efficiency and reliability of the sprinkler systems, in this paper we analysis and discuss a problem about sprinklers arrangement. Use the water distribution curve of ZST-15 and the MATLAB to accomplish a 3D surface fitting among radius of protection, working pressure and mounting height as well as get a function expression about them. After that, aiming at the problems happened in engineering practice, we propose a method of determine the sprinklers arrangement distance and their mounting height, in addition give suggestions about choosing fire pools and work out the flow rate of sprinkler systems through calculation as well.