For the shortage of the current study on measurement uncertainty evaluation of turbine nozzle throat area measured by coordinate measurement machine (CMM), a measurement uncertainty evaluation model of turbine nozzle throat area measured by CMM was proposed by analyzing measurement procedure and principle. Finally, measurement uncertainties of single throat area and area of all throat in circle were evaluated according to a measurement case. The evaluation result shows the CMM method could meet the design requirement of turbine nozzle throat area.