A dual-origin-coordinate system is made up of a CE output characteristics-coordinate and a voltage coordinate of power sour c e.It can analyse the dynamic state of CE amplifier in graphical method, and CC a mplifier can also. It has been proved that (1)/(R′L+Re) is not the A C load line slope of CE amplifier.%提出了由共射输出特性曲线坐标与电源电压 坐标组成的双原点坐标系。能很好地解决共射与共集两类电路的动态图解分析问题。证明了1/(R′L+Re)不是共射电路的交流负载线斜率，四种共射电路交流负载线斜率 公式是相同的。
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