Let ℝ be the real number axis. Suppose that G , H are C m maps from ℝ 2 n + 3 to ℝ . In this note, we discuss the system of finite difference equations G ( x , f ( x ) , f ( x + 1 ) , … , f ( x + n ) , g ( x ) , g ( x + 1 ) , … , g ( x + n ) ) + 0 and H ( x , g ( x ) , g ( x + 1 ) , … , g ( x + n ) , f ( x ) , f ( x + 1 ) , … , f ( x + n ) ) = 0 for all x ∈ ℝ , and give some relatively weak conditions for the above system of equations to have unique C m solutions ( m ≥ 0 ) .