A novel probe is put forward based on the nano optical antenna which is added by a metallic dipole nano-antenna onto the tip of the ordinary probe. When the sample light arrives at the nano-antenna,the huge field enhancement will be obtained at the antenna feedback for the surface plasmon resonances produced on the surface of the metal. The light coupled into the probe and the signal-to-noise ratio is increased,and then the higher resolution is realized. Based on the FDTD algorithm the measure results are investigated numerically by different aperture probes for the same sample with the incident wavelength of 830 nm and the scan height of 10 nm.The results show that the the new probe resolution with aperture increass first and then decreases with the change of the aperture diameter and reaches the highest of 45 nm at 150 nm which is four times of the ordinary probe resolution. The optical fields on the probe with different diameter are analyzed. The results show that the change law of the new probe resolution is caused by the different efficient length of nano-antenna on the probe. The results also show that the new probe has higher sensitivity and contrast ratio.