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To investigate the inhibitory effect of a new compound of GLB on tumor metastasis in vivo and analyze its actions on tumor cell adhesion to clarify its mechanism. The effect of GLB on tumor metastasis was analyzed by Lewis lung carcinoma model. The pathological morphology of lung alveolar was evaluated by hematoxylin-eosin staining. The effect of GLB on the proliferation of human prostate cancer cell (PC-3M, with a high metastatic characteristic) was studied using the MTT method, and its actions on PC-3M cell adhesion to human umbilical vein endothelial cells (HUVEC) and laminin were analyzed in vitro. GLB (100 mg·kg-1·d−1 for 28 d, ig) reduced the number of lung colonies of Lewis lung carcinoma metastasis significantly ( P < 0.05). Simultaneously, GLB could mitigate the damage of lung alveolar caused by metastasic tumor deposits. In vitro, GLB inhibited dramatically the adhesion of PC-3M cells to HUVEC ( P < 0.01) and laminin ( P < 0.05), without cytotoxic or anti-proliferative action on PC-3M cells. GLB has anti-tumor metastatic activity, which partly depends on its inhibition of tumor adhesion. [ABSTRACT FROM AUTHOR]