为了研究直排式厕所排泄物对车内外污染 ,采用了模拟和现场 2种实验手段 ,证明了排泄物对旅客列车的污染状况 ,结果为 :模拟试验碱性液体随列车运行呈不规则变化 ,污染主要集中在第 5、6窗口 ;现场实验直排式厕所的车厢、2节车厢联接处、走行部的阳性率分别为 61.1%、 77.8%、76.2 %。密闭式厕所的阳性率仅为 1.6% (车厢 )。而作为对照样的机车头无论是直排或密闭式厕所均未出现阳性结果 In order to study the in-house toilet excrement pollution inside and outside the car, the simulation and field 2 kinds of experimental methods were used to prove the excretion of passenger train pollution status, the result is: simulation test alkaline liquid with the train operation showed irregular changes, The pollution was mainly concentrated in the 5th and 6th windows. The positive rates of in-situ experimental in-line toilets, two carriages joints and walking sections were 61.1%, 77.8% and 76.2% respectively. The positive rate of closed toilets was only 1.6% (car). As a control of the locomotive either in-line or closed toilet did not appear positive results