TRGB，tip of red giant branch，红巨支顶点恒星。根据恒星演化理论，TRGB是一类具有典型性质的红巨星，处于这个阶段的红巨星具有相仿的光度和颜色，且这些红巨星普遍存在于各种不同的星系中。所以通过对TRGB的光度进行定标，并规范化数据处理的流程和方法，可以将TRGB作为一类优良的标准烛光，广泛应用于对各种不同星系和星团的测距中，优化目前天体距离测量中常用的距离阶梯精度，为未来对近邻宇宙的哈勃常数进行更高精度的测定以及宇宙学研究提供额外的方法，并降低该方法的系统误差。本文以TRGB方法为基础，测量天炉座矮星系（Fornax Dwarf）的距离。在此前的研究中，人们通过造父变星、Ia型超新星、天琴座RR变星、水平分支恒星、红团簇、以及TRGB方法，得到了集中在143±10kpc范围内的若干结果。本文利用Gaia卫星最新的巡天数据，筛选并构建数据集，优化TRGB方法的数据处理过程，重新测定天炉座矮星系的高精度距离，最终测得距离模数 = 20.877 ± 0.024 (stat) ± 0.1 (sys) mag，或149.8±8.1kpc。

TRGB, Tip of Red Giant Branch, a specific stage of red giant star which has a series of typical properties including similar color and luminosity, according to the theory of stellar evolution. TRGB can also be commonly found in various galaxies, which made it have the potential of an excellent kind of Standard Candle, served in distance measurement of different galaxies and clusters. The TRGB, as a distance indicator, provide an independent method to achieve distance measurement in local universe and optimizing the current distance ladder consist of Cepheid and Type 1a Supernova (SN 1a), which could enable further study of measuring the Hubble constant in higher precision and resolving the problems of Hubble Tension. In our study, we measure the distance of the Fornax Dwarf galaxy based on the TRGB method. Previous researches have provided several distance within an approximate range of 143±10kpc, using Cepheids, Type Ia Supernova(SN Ia), RR Lyrae(RRL), Horizontal Branch stars(HB), Red Clump(RC), and TRGB methods. In this study, we use the latest data from Gaia survey, selecting and constructing new dataset, improve the current data processing of the TRGB method, and re-measure the high precision distance of the Fornax Dwarf. The final distance modulus is = 20.877 ± 0.024 (stat) ± 0.1 (sys) mag, or 149.8 ± 8.1 kpc.