采用目前在用的导热系数测定仪测量土壤导数系数时，必须对土壤取样，以做成不同形状的试样，这样就改变了土壤的实际密度和湿度等物理特性，因而测量值不是土壤的实际导热系数。而我们研制的DQ型导热系数测定仪，是采用标准环刀进行取样，这样能保证在原状上情况下进行测试， When measuring the coefficient of soils using currently available thermal conductivity meters, the soil must be sampled to make specimens of different shapes, thus changing the physical properties of the soil, such as its actual density and humidity, so that the measured values ​​are not real Thermal Conductivity. And we developed DQ-type thermal conductivity detector, is the use of standard ring knife sampling, so as to ensure the case of the original test,