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利用大腔体静高压装置的实验数据,提出了“极限压缩体积比”的概念以及腔体与组装设计的一般性原理。通过对极限压缩体积比的分析,设计出了样品腔体达到厘米级的36/20(正八面体传压介质边长为36 mm/末级压砧正三角形截角边长为20 mm)组装。采用原位电阻观测 Bi(Ⅲ-Ⅴ,7.7 GPa),ZnTe(Ⅰ-Ⅱ,5 GPa；Ⅱ-Ⅲ,8.9~9.5 GPa；半导体-金属,11.5~13.0 GPa)和 ZnS(半导体-金属,15.6 GPa)在高压下相变的方法,标定了36/20组装的腔体压力。实验结果表明所设计样品腔的尺寸大于10 mm,压力可以达到15 GPa 以上。本工作使得基于国产6×2500 t(吨)铰链式六面顶压机的二级6-8型静高压装置在高压实验研究中具有更加广阔的应用前景。“,”By analyzing experimental data,we put forward the concept of the limit compression volume ratio and the general design principles of centimeter magnitude sample chamber for two-stage 6-8 type static high pressure apparatus.Based on the limit compression volume ratio,we designed an assembly of 36/20 (Octahedral edge-length 36 mm/anvil truncation edge-length 20 mm)with high pressure generating efficiency.Pressure calibration at room temperature for the 36/20 assembly was performed using the phase transitions of Bi (Ⅲ-Ⅴ,7.7 GPa),ZnTe (Ⅰ-Ⅱ,5 GPa;Ⅱ-Ⅲ,8.9-9.5 GPa;semicon-ductor-metal,1 1.5-13.0 GPa)and ZnS (semiconductor-metal,15.6 GPa).The experimental results show that the pressure of sample chamber exceeds 15 GPa and the sample diameter reaches 1 cm.The improvements of two-stage 6-8 type static high pressure apparatus have great potential applications in high-pressure experimental research and industrial production.