Objective: To analyze the therapies of the colorectal neoplasms accompanied by dermatomyositis; Methods: Seven cases of colorectal neoplasms accompanied by dermatomyositis were analyzed Results: Five cases were completely controlled, one case was partly controlled and one was dead Conclusion: Colorectal neoplasms accompanied by dermatomyositis have some characteristics, such as obstructive lung diseases, unhealed wound, dysfunction of some viscera,bad prognosis, inapplicability of penicillins, and so on As a result, we should apply combined modalitytherapy Enough preparation for operation, reasonable steroid therapy to control the dermatomyositis and prompt observation and dealing before and during the operation play an important role in the treatment for the colorectal neoplasms accompanied by dermatomyositis