In quartz pot sinter test， with the bed depth varying from 700 mm to 850 mm and 1 000 mm， sintering yield and TI gradually increase， the sinters size distribution becomes better， sintering solid fuel consumption reduced; but the vertical sintering speed significantly slow， sintering productivity decreased. Doing dissection test of 700 mm， 850 mm and 1 000 mm depth bed sintering in turns， TI and sinters size distribution result of upper layer， middle lay- er and bottom layer is get as followed， at the same layer， sinters size distribution and TI is 700 mm <850 mm< 1 000 mm . At the same depth， average sinters size is upper < middle