The aim of this paper is twofold. Firstly, we consider the existence of solutions to a type of complex functional-differential equations
(w')^{n}w^{(n)}=aw^{n+1}(g)+bw+d
in complex variables. We obtain g is linear when w is a transcendental meromorphic function and a≠0, b, d are constants. In addition, due to the different properties between equations and system of equations, it is meaningful to research systems of equations, this paper is also concerned with a type of system of functional equations, properties of meromorphic solutions are obtained under some proper conditions. Examples are constructed to show that our results are accurate.