Abstract: The relationship between pressure and discharge in multi-stage path drip irrigation tape and the deviation parameters of the outlet discharge are tested. At the same time discharge variety from outlets under the circumstance of clogging by means of the simulation method were researched. The experimental results showed that the same path section with different path constructions had an effect on flow status index. But that did not affect the deviation parameters. The whole straightway multi-stage path had an obvious complement effect on flow discharge when clogging happened in some stage paths, and the impact range of the first stage path introduced is bigger, the reduction ratio of the outlet discharge is higher.