Ａｒ气初始压力为０．１ＭＰａ，初始温度为２９３Ｋ，Ａｒ等离子体５个实验点的压力为０．１２５－０．１６３ＧＰａ，电子密度ｎｅ≈１０１９ｃｍ－３，非理想性参数Γ为０．４３－０．４５的条件下测量了非理想Ａｒ等离子体Ｈｕｇｏｎｉｏｔ曲线。冲击波速度由光谱辐射信号确定，粒子速度由实测飞片速度、阻滞法和等熵线确定。实验的Ａｒ等离子体Ｈｕｇｏｎｉｏｔ曲线与考虑二级电离效应后Ａｒ等离子体的理论ｐ－ｕ线符合得很好 Ar gas initial pressure of 0.1MPa, the initial temperature of 293K, Ar plasma plasma pressure at five experimental points 0.125-0.163GPa, electron density ne ≈ 1019cm-3, the non-ideality parameter Γ 0.43- Hugoniot curve of non-ideal Ar plasma was measured under the condition of 0.45. The shock wave velocity is determined by the spectral radiation signal, and the particle velocity is determined by the measured flying-velocity, retardation method and isentropic line. The experimental Ar plasma Hugoniot curve is in good agreement with the theoretical p-u line of Ar plasma after considering the secondary ionization effect