The optical properties of the subwavelength metal structure have become a hotspot of optical research. The influence of metal nano-antenna on optical wave transmission through the subwavelength hole on metal film is investigated by applying the three-dimensional finite-difference time-domain (3D FDTD) method. Nano-antenna is laid in front of and behind a metal film with a hole, respectively. The zeroth-order transmittances are obtained. It is found that the second-order and third-order enhanced transmission is realized under the phase matching condition when the orders of resonances mode of antenna and hole are the same. Energy can be coupled into the hole to enhance the near fields through antenna resonance when the antenna is laid in front of the hole, while coupled out of the hole through antenna resonance when the antenna is laid behind the hole.