The transition zone less than 55 m is accomplished in a portable micro pulse (MPL) Lidar system based on the dual fieldofview (FOV) design. This dual FOV lidar system overcomes the traditional deficiency of the Mielidars with a wide blindtransition zone which based on the single FOV design due to the geometricfactor effect. The schematic structure and the technical parameters of this dual FOV Lidar system are revealed in this study. The combination method of the two FOVs′ return signals is explored. In this way, not only ensure the effective detection for the far field but also the blind zone to almost zero for the near field detection is squeezed. The parallel comparison with a longterm running traditional Mie Lidar is conducted with a pearson coefficient of 098, slop of 292 and intercept of 011 a.u., which proves the novel performance of this dual FOV Lidar. Due to the portability, it can be easily applied on the vehicle, aircraft, etc. The typical online diurnal variation of vertical aerosol extinction coefficient profiles verifies the effective measurement for the atmospheric aerosol in range of 10 km.