A 15-year-old female was admitted to our hospital with intermittent fever, cough and sputum for one week, and diagnosed as pneumonia. Because of no clinic remission with antibiotic and antiviral treatment for one week and following with facial erythema, severe anemia, and neutropenia, appropriate screening laboratory examinations showed severe lower complements (C3, C4) and positives autoantibody such as ANA, ds DNA, Anti-Sm etc, Therefore, SLE was diagnosed with muti-organs involved including lungs, blood, liver, kidney, medical peritonitis, and central nervous system presented as irritable and moody. Because the patient complained of dizziness, fatigue, anorexia, hands trembling and showed a very indifferent mood, endocrinological tests were took. The results revealed very low levels of sex hormones, thyroid hormones and serum cortisol, and manifested as hypopituitarism. Magnetic resonance imaging (MRI) of pituitary region demonstrated a mild enlargement of the pituitary stalk. SLE associated with Lymphocytic hypophysitis (LYH) was suspected. And the clinical symptoms and laboratory tests were ameliorated after glucocorticoid treatment (involve twice methylprednisolone (MPIV) pulse therapy and oral 40 mg/d of MPIV) combined with cyclophosphamide therapy. Although, LYH associated with SLE have been reported, a 15-year teenager, as seen in this case, is a rare first presentation of SLE.