  We introduce a new method for deriving Feynman integral symmetry relation. By
solving the ansatz of momentum transformation in the field of rational
functions rather than constants, the method can sometimes find more symmetry
relations, comparing with some state-of-art software. The new method may help
to further decrease the number of master integrals in an integral family.
Well-chosen gauge conditions are implemented in this method, for the efficient
symmetry searching.
