Objective This article explores laboratory inspection and clinical characteristics of bone marrow metastatic cancer in order to improve its diagnostic accuracy.Method 30 patients from January 2008 to January2015in one of Guiyang hospital were diagnosed with bone marrow metastatic cancer by bone marrow biopsy and bone marrow aspiration.This paper analyzed clinical characteristics of this disease based on results of laboratory inspection.Results The most common clinical characteristics was anemia

followed by bone pain

fever

emaciation

poor appetite and bleeding.28patients′（93.3%）level of tumor marker became higher

20patients′（66.7%）level of lactic dehydrogenase（LDH）increased

21patients′（70.0%）level of alkaline phosphatase（ALP）enhanced

12patients′（40.0%）level of serum ferritin（SF）climbed

21patients′（70.0%）level of albumin（ALB）decreased.The results of bone marrow biopsy showed that 2cases（6.7%）had evidently active myelosis

26cases（86.6%）were active and 2cases（6.7%）had fewer myelosis.The bone marrow aspiration presented that cancer cells distributed as individual or clustered on the tail and edge of smears.Conclusion Clinical doctors must increase the awareness of bone marrow metastatic cancer

comprehensively analyze patients′medical history

signs and results of laboratory examination so as to enhance the diagnostic accuracy.