The mean of serum 25(OH)D3 level was 22.80 ± 16,23 ng/mL.14 patients (25.5%) had vitamin D deficiency (<10 ng/mL), 34 patients (61.8%) had vitamin D insufficiency (10-30 ng/mL), and 7 patients (14.7%) had normal vitamin D levels. There were significant difference level of anti-dsDNA antibodies (112.46 vs 267.13 U/ml; p < 0.05) and IgM ACA (16.40 vs 29.7 IU/ml; p < 0,05) in patients with vitamin D insufficiency and vitamin D defisiency. Serum level of 25(OH)D3 were negatively related with level of anti-dsDNA and IgM ACA (r: - 0, and r: - 0,72 respectively). The mean of SLEDAI was 15,0 + 10.46. Serum vitamin D levels were inversely correlated with SLEDAI (R=-0.319, p<0.05). Normal BMD at lumbal spine found in 21 (38.2%) patients. 26 patients (47.3%) were osteopenia, and 8 (14.5%) patients were osteoporosis. At femoral neck, 25 (45.5%) patients had normal BMD, 23(41.8%) patients were osteopenia, 7 (12.7%) patients were osteoporosis. There were no significant correlation between vitamin D level and BMD at lumbal spine (p = 0,531) and at femoral neck (p = 0,175).