Abstract: An expression was derived for the pyroelectric coefficient of ferroelectric ceramic-ferroelectric polymer 0-3/1-3 composites; the influence of ceramic volume fraction v₂ and the ratio of ceramic grain size to film thickness(G/t) on the pyroelectric coefficient(p_c) and p_c/ε _c of ferroelectric composites is discussed. The results show that when G/t≥0.5, at different ceramic volume fractions v₂, the pyroelectric coefficient tends to become constant. This means that the influence of G/t on the pyroelectric coefficient is neglectable. When ceramic volume fraction v₂=0.1 and G/t increases, p_c/ε_c will reach its maximum. When G/t=0.9, p_c/ε_c of ferroelectric composites is 8 times larger than that of pure PZT ceramics. v₂=0.1 and G/t=0.9 were the best technological condition. Additionally, theoretical curves and experimental data fit each other at low ceramic volume fractions and low G/t.