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ATM: To measure the subfoveal choroidal thickness(SFCT)in myopia using Cirrus HD optical coherence tomography(OCT), and to explore the relationship between the SFCT, axial length and myopic refractive spherical equivalent.<p>METHODS: One-hundred thirty-three eyes of 70 healthy volunteers were recruited, and were divided into emmetropia group, low-degree myopia, middle-degree myopia and high-degree myopia group. SFCT were measured by Cirrus HD OCT, and the relationship between the SFCT, axial length and myopic refractive spherical equivalent were evaluated.<p>RESULTS: 1)Average SFCT was(275.91±55.74)μm in normals, that in emmetropia group, low-degree myopia, middle-degree myopia and high-degree myopia group were(290.03±34.82)μm,(287.64±51.51)μm,(274.95±56.83)μm,(248.37±67.98)μm; 2)the SFCT of high-degree myopia group was significant thinner than that of emmetropia group(<i>P</i><0.05); 3)There was a significant negatives correlation between the SFCT and axial length(<i>P</i><0.01), a significant positive correlation between SFCT and myopic refractive spherical equivalent(<i>P</i><0.01).<p>CONCLUSION: the SFCT is inversely correlated with increasing axial length and myopic refractive error.