The clinical study of pasting "Wei Tan Wai Fu Fang" on acupuncture point to treat patients suffering postoperative gastroparesis of digestive cancer

INTERVENTION: This is a double‐blind randomised parallel group multi‐site trial.120 volunteers are divided into two groups by a certain people who won?t participate in the clinical observation so as to ensure the double‐blind observation. Patients in Group 1 will be treated with ?Wei Tan Wai Fu Fang? as well as conventional therapy (parenteral nutrition, gastrointestinal decompression, prokinetic drugs). Patients in Group 2. will be treated with the placebo of ?Wei Tan Wai Fu Fang? and conventional therapy. CONDITION: Postoperative gastroparesis of digestive cancer ; Cancer ; Ill‐defined sites within the digestive system PRIMARY OUTCOME: Clinical efficiency: It is effective when a patient restores motility in two weeks or he is able to take in nutrients by himself after unplugging the nasogastric tube. It is measured by the Gastroparesis Cardinal Symptom Index. SECONDARY OUTCOME: 1. Gastroparesis symptom score ; 2. The amount of stomach drainage or vomiting; Outcomes will be recorded on the 1st, 3rd, 5th, 7th and 14th day of the treatment. INCLUSION CRITERIA: 1. Aged 18 years or older 2. Patients suffering postoperative gastroparesis of digestive cancer 3. Local identification is cold pattern. This means that, this kind of patients prefer warm to cold, likes hot food and hates cold one)