<p>In response to the national strategy for maritime power enhancement, there is a critical need for deep-sea temperature sensors with short response times and high sensitivity. This study aims to support the increasing domestic substitution trend for CTD measuring instruments used in marine surveys. By integrating high-precision marine temperature measurement requirements, we have employed a technique that involves the use of a temperature equalization block for instantaneous comparison, fixed calibration temperature points, and varying the degree of polynomial fitting. A fitting program was developed using MATLAB to compare the performance of the Hoge equation with different degrees of fitting within the marine temperature range. The study also assessed the uncertainty of fitting residuals and analyzed the long-term stability of NTC thermistor thermometers, clarifying the methods for verifying long-term stability. The results indicate that the performance of the Hoge equation with 3rd, 4th, and 5th order for NTC thermistor thermometers meet the high-precision measurement requirements of the marine temperature range. A method for verifying the long-term stability of NTC thermistor thermometers at the water triple point was adopted, and the calibration efficacy meet the requirements for the domestic substitution of temperature sensors in CTD measuring instruments and the precision demands of deep-sea temperature measurement. High-precision measurement equipment, a stable calibration environment, appropriate calibration methods, and proper data processing are essential for achieving high-precision calibration efficacy. The findings of this study contribute to defining standards for the selection of temperature sensors in marine survey CTD measuring instruments and deep-sea temperature sensors, providing a reference for the metrological calibration and long-term stability verification of NTC thermistor thermometers&#xa0;°C.</p>