Using the MSP430 series SCM integration sections of LCD driver module and 16 Σ-Δ AD converter,combining high temperature coefficient of NTC thermistor,we design a high-precision low-power portable digital thermometer.Framework are introduced in detail the system principle,the NTC thermistors feature,AD sampling principle of temperature,16Σ-Δ adc and the realization of the software.In the practical application with high precision,low power consumption,short measurement time,the advantages of convenient alternatives to traditional mercury thermometer.