Abstract: In this paper, we investigate the growth of solutions of the differential equations f^（k）+ A_k-1（z）f^（k-1）+ ··· + A₀（z）f = 0, where A_j（z）（j = 0, ···, k-1） are entire functions.When there exists some coefficient A_s（z）（s ∈ {1, ···, k-1}） being a nonzero solution of f’’+P（z）f = 0, where P（z） is a polynomial with degree n（≥ 1） and A₀（z） satisfies σ（A₀） ≤1/2 or its Taylor expansion is Fabry gap, we obtain that every nonzero solution of such equations is of infinite order. 

Key words: entire function, differential equation, growth of order