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Electrical conductivities of the clinopyroxene (Cpx)‐NaCl‐H2O system with various salinities (5, 10, 15, 20, 25 wt%) and fluid fractions (5, 10, 15, 20, 25 vol%) were measured at 1 GPa and 673–973 K. For comparison with electrical properties of the Cpx‐NaCl‐H2O system, the conductivities of dry Cpx, hydrous Cpx, and a Cpx‐H2O system were researched at the same temperature and pressure. The experimental results included (1) the electrical conductivities of all samples that were associated with Cpx and the temperatures conform to the Arrhenius relationship that is used to fit the activation enthalpy, which decreased with increasing salinity (mass fraction of NaCl in saline fluids) and fluid fraction (volume fraction of saline fluids in the Cpx‐NaCl‐H2O system); (2) at a fixed fluid fraction of 10 vol%, the conductivities of the Cpx‐NaCl‐H2O system increased slightly with an increase in salinity, and the gap between the conductivities of the systems with 5 and 25 wt% saline fluids was approximately 1 order of magnitude; (3) at a fixed salinity of 5 wt%, the conductivity of the Cpx‐NaCl‐H2O system with 25 vol% saline fluids was approximately 1.5 orders of magnitude higher than that of the system with 5 vol% saline fluids. Furthermore, it was proposed that the unusually high conductivities of southern Tibetan Plateau, Dabie Orogen, Grenville province and central New Zealand can be caused by clinopyroxene with interconnected saline fluids with corresponding salinities and fluid fractions. Key Points: Electrical properties of clinopyroxene‐NaCl‐H2O system with various salinities and fluid fractions were for the first time researchedSalinity and fluid fraction significantly influence the conductivities of clinopyroxene‐NaCl‐H2O system, but the temperature effect is weakSome high‐conductivity anomalies in the deep crust and subduction zone can be caused by the clinopyroxene‐NaCl‐H2O system [ABSTRACT FROM AUTHOR]