 The current IMRT can simultaneously achieve prophylactic dose DT 50Gy and radical dose DT 60-64Gy in respective target volume by using inverse intensity-modulated planning system. However, it is still controversial on whether esophageal carcinoma can receive prescription dose more than 2.0Gy each time. That is to say, it is challengeable to find an optimal fraction dose and total dose between tumor and adverse effects. For this reason, the dose escalation trial is to be conducted to explore the clinical value and optimal dose to esophageal carcinoma with different radiosensitivity, and also provide data support for phase III clinical trials. 