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Objective:The purpose of this study was to assess the clinical application value of bone turnover markers in non-small-cell lung cancer (NSCLC) patients with bone metastases. Including diagnosing bone metastases, detecting bone metastatic spread. Methods: Alkaline phosphatase (AKP), p-C-terminal telopeptide of type I collagen (B-CTx), osteocalcin (OST) and bone alkaline phosphatase (BALP) were measured in 76 patients with bone metastases from NSCLC and 44 normal people. Results: The level of AKP, B-CTx and BALP in patients with bone metastasis was significantly higher than in the normal people. Significant correlation was observed among bone turnover markers. The levels of BALP and OST were significantly correlated with the extent of bone metastasis. The patients with high-level CTx and low-level BALP had higher risk of pathologic fracture. Conclusion: In NSCLC patients with bone metastases, bone turnover markers can help to make diagnosis and evaluate the severity. It will have a wide range of use in clinical practice.