Let q n be the bi-periodic Fibonacci numbers, defined by q n = c(n)q n−1 + q n−2 (n ≥ 2) with q 0 = 0 and q 1 = 1, where c(n) = a if n is even, c(n) = b if n is odd, where a and b are nonzero real numbers. When c(n) = a = b = 1, q n = F n are Fibonacci numbers. In this paper, the convolution identities of order 2, 3 and 4 for the bi-periodic Fibonacci numbers q n are given with binomial (or multinomial) coefficients, by using the symmetric formulas.