pseudomonas pneumonia is a common and serious complication in neurosurge-ry. Its prognosis is poor and mortality high.The therapeutic effect of EP on 9 cases of pseudomonas pneumonia was studied from Sep. 1979 to Nov. 1981. The satisfactory results obtained were: the fever was lowered, the expectoration diminished, the antibody titer raised,the other symptoms and signs improved, and the bacterial culture converted negative.The results indicate that EP has some therapeutic value on pseudomonas pneumonia which is insensitive to most antibiotics.