Abstract: In order to improve the warp tension control and prevent too much variations which result in negative impact on the fabric quality,Fuzzy-PID controller was used to control the warp tension based on researches on the existing control methods of warp tension.And some warp control rules are given according to researchers′ experience.On-line testing of the warp tension is affected by a test system consisting of the computer,software,and sensor and so on.The experiment is carried out on SAURER400 loom.The results show that it is effective in controlling the warp tension for restraining tension crest value and reducing warp end breakage,not only reducing tension variations,but also improving tension discrete index.And the starting marks of the fabric have been decreased significantly.