XT所有的数据在内部安装国际标准单位制保存， 用户可自定义视图单位系，使得界面以合适的单位系显示数据并与用户交互。视图单位系的单位类型如下表所示，在对话框XML文件中可通过unit定制标签的单位属性，可通过DX_UnitEdit与界面交互带单位属性的数据。
| 单位枚举量 | 类型字符串 | 类型ID |
|---|---|---|
| Unit_Length | “Length” | 0 |
| Unit_Time | “Time” | 1 |
| Unit_Mass | “Mass” | 2 |
| Unit_Force | “Force” | 3 |
| Unit_Angle | “Angle” | 4 |
| Unit_Temperature | “Temperature” | 5 |
| Unit_Area | “Area” | 6 |
| Unit_Volume | “Volume” | 7 |
| Unit_Velocity | “Velocity” | 8 |
| Unit_Acceleration | “Acceleration” | 9 |
| Unit_RotateVelo | “AngularVelocity” | 10 |
| Unit_RotateAcc | “AngularAcceleration” | 11 |
| Unit_Moment | “Moment” | 12 |
| Unit_Pressure | “Pressure” | 13 |
| Unit_Density | “Density” | 14 |
| Unit_Stiffness | “Stiffness” | 15 |
| Unit_RotateStiff | “RotateStiffness” | 16 |
| Unit_DampingCoef | “DampingCoefficient” | 17 |
| Unit_RotateDampingCoef | “RotateDampingCoefficient” | 18 |
| Unit_Modulus | “ElasticModules” | 19 |
| Unit_Energy | “Energy” | 20 |
| Unit_Power | “Power” | 21 |
| Unit_ThermalExCoef | “ThermalExpansionCoefficient” | 22 |
| Unit_ThermalConductivity | “ThermalConductivity” | 23 |
| Unit_ConvectionCoef | “ConvectionCoefficient” | 24 |
| Unit_SpecificHeat | “SpecificHeat” | 25 |
| Unit_HeatFlux | “HeatFlux” | 26 |
| Unit_HeatGeneration | “HeatGeneration” | 27 |
| Unit_LinearDensity | “MassPerUnitLength” | 28 |
| Unit_SurfaceDensity | “MassPerUnitArea” | 29 |
| Unit_AreaMomentInertia | “AreaMomentInertia” | 30 |
| Unit_TorsionalConst | “TorsionalConstant” | 31 |
| Unit_WarpCoef | “WarpingCoefficient” | 32 |
| Unit_LinearMassMomentIntertia | “MassMomentOfInertiaPerUnitLength” | 33 |
| Unit_MomentInertia | “MassMomentOfInertia” | 34 |
| Unit_Stress | “Stress” | 35 |
| Unit_Strain | “Strain” | 36 |
| Unit_StrainEnergy | “StrainEnergy” | 37 |
| Unit_ThermalEnergy | “ThermalEnergy” | 38 |
| Unit_Frequency | “Frequency” | 39 |
| Unit_VolumeEnergyDensity | “VolumeEnergyDensity” | 40 |
| Unit_ElectricalResistivity | “ElectricalResistivity” | 41 |
| Unit_StressReciprocal | “StressReciprocal” | 42 |
| Unit_ThermalRadiation | “ThermalRadiation” | 43 |
| Unit_DynamicViscosity | “DynamicViscosity” | 44 |
| Unit_KinematicViscosity | “KinematicViscosity” | 45 |
| Unit_FlowRate | “FlowRate” | 46 |
| Unit_VelocityReciprocal | “VelocityReciprocal” | 47 |
| Unit_EquivalentViscosity | “EquivalentViscosity” | 48 |