Positions impacting on a virtual plane on trajectory,flying velocity,and the flying direction angle of velocity,which are the parameters of flying projectiles in ballistic trajectory,must be measured in ranger.Because of drawback of four-screen measuring system and two-screen velocity measuring method,an improved six-light-screen array is presented that is composed of six large area light screens.The six-light-screen array presented at the first time can be shaped by changing a position of one light screen in the present basic six-light-screen array.Two kinds of arrays can measure synchronously all above parameters of flying projectiles.They are basic arrays and other different arrays can be obtained by rotating and shifting the different light screens.The principle of measurement is described in the paper.And the derived process of measurement formula is given in detail.The presented six-light-screen array can be used as a sensor in automatic target-reading systems.