To　probe　into　the　reasons　for　misdiagnoses　of　pelvic　tumor　as　deep　venous　thromboses　as　well　as　the　diagnostic　methods　and　effective　treatments　on　pelvic　tumor.　Four　case　reports　on　misdiagnosing　pelvic　tumor　as　deep　venous　thromboses　and　further　analysis　on　the　causes　of　misdiagnosis,　diagnosis,　and　treatment　with　the　literature　study.　The　four　cases　were　misdiagnosed　as　pelvic　tumor,　which　actually　were　fibroneuroma,　myxo-fluidity　liposarcoma,　moderately　differentiated　squamous　cell　carcinoma,　and　synovial　sarcoma,　respectively.　The　tumor　in　first　case　was　completely　removed,　and　the　tumor　in　other　three　cases,　which　were　malignant　tumors,　were　resected　when　the　tumors　shrank　with　clear　boundary　and　less　blood　supply　after　applied　with　3　cycles　of　intra-arterial　chemotherapy　via　an　implanted　pumpies.　Pelvic　tumor　usually　show　up　or　is　misdiagnosed　as　deep　venous　thromboses　for　its　untypical　clinical　manifestation,　so　it　should　be　on　the　alert　for　pelvic　tumor　when　deep　venous　thromboses　occurs.　Tumor　resection　is　preferred　for　benign　tumor,　and　intra-arterial　intervention　chemotherapy　should　be　applied　first　for　malignant　tumor　followed　by　surgery.