The mode matching in high-power end-pumped Nd:YVO₄solid-state lasers has been investigated by employing two different Nd³⁺-doped crystals at pump power of 10 W and 14 W, respectively. The results show that the output power in TEM₀₀mode is insensitive to the ratio of fundamental mode radius to averaged pump spot radius (w₁/w_pa) over a large range of w₁/w_pa<1, and there is no obvious optimal w₁/w_paratio at which the output power is maximized. The results also indicate that high efficient radiation in single TEM₀₀mode is still available in the situation of very small w₁/w_paratio due to the aperture effect arising from thermal lens spherical aberrations.