Objective:To study the correlation of tumor-associated macrophages infiltration , MMP-2 expression and angiogenesis in colon carcinoma by testing the MMP-2 through immunological methods ,and counting of macrophages and distributing of vessels in colonic adenocarcinoma at different differential degrees .Methods: Analyze the infiltration of tumor-associated macrophages (TAMs),and count blood capillaries in 79 patients with colon carcinoma by immunohistochemical staining ,detect the expression of MMP-2 in macrophages by immunological methods .Analyze the relationship among numbers of macrophages and vessels , clinical pathology and expression of MMP-2.Results: Macrophages in colon carcinoma were labeled to brown yellow by murine monoclonal antibody to human.The number of macrophages was markedly higher than normal group (F=412.04,P<0.05); Variance of macrophages number had statistical significance in differentiatial degrees and Duck ′s staging of colon carcinoma ( t=10.80 and F=412.04,P<0.05);variance of microvessel density(MVD) had statistical significance in Duck′s staging of colon carcinoma(t=7.35, P<0.05 ) ,MVD in colon carcinoma patients with lymphatic metastasis was higher than patients without lymphatic metastasis ( t=6.77 , P<0.05).Expression of MMP-2 in colon carcinoma showed strong positive.Expression of MMP-2 in patients with lymphatic metastasis was higher than patients without lymphatic metastasis ( t=10.91 , P<0.05 ) . There was a positive relationship among MMP-2 expression,number of tumor-associated macrophages(TAMs) and MVD(r=0.451,0.672,P<0.05,respectively).Conclusion:MMP-2 and TAMs correlated closely with the development of colon carcinoma .TAMs in colon carcinoma can promote the angiogenesis ,growth and metastasis of the tumor by up-regulating the expression of MMP-2.