To equalize water content of a woven cloth after dewatering by controlling dewatering potential depending on the water content of the woven cloth in the width direction by effectively using potential of an aspirator.

The dewater system is installed between frames of a loom and comprises a suction tube having suction opening which comes into contact with the woven cloth, a first and a second steam separator, a first connecting tube connecting the end part of an anti-thread feeding side of the suction tube to the first steam separator, a second connecting tube connecting the end part of thread feeding side to the second steam separator, at least an aspirator and a third connecting tube connecting the first steam separator and the aspirator, and a fourth connecting tube connecting the second steam separator and the aspirator.