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The purpose of this study was to investigate the relationship between Back extensor strength (BES) and SPINE FLEXIBILITY with degree of kyphosis and lordosis in young healthy people. One hundred healthy male students participated in this study (23.27±1.41 age, 177.42±6.64 cm, 65.17±10.63 kg). BES measured by using standard digital dynamometer KE-D300. SPINE FLEXIBILITY and degree of kyphosis and lordosis measured by using Spinal mouse 3.2 (non-invasive tool). The relationship of variables was determined by using Spearman Correlation Coefficients. Results showed significant negative correlation between BES and degree of kyphosis (r=-0.72, P< 0.05) and significant positive correlation between BES and degree of lordosis (r= 0.28, P< 0.05). But there was no significant correlation between SPINE FLEXIBILITY with degree of kyphosis (r=-0.04, P> 0.05) and lordosis (r= 0.06, P> 0.05). Among variables regression analysis revealed that BES was the best predictor of kyphosis (R2= 55% b=-0.73, P< 0.05) and lordosis (R2= 24%, b= 0.30, P< 0.05). According to the results as BES increased, degree of kyphosis decreased while degree of lordosis increased manually, but there is no relationship between SPINE FLEXIBILITY with degree of kyphosis and lordosis.