The laser spot echo imaging experiment was carried out on a 1 km transmission path in a turbulent atmosphere using a reentry path laser imaging detection system constructed by red laser, 3M microcrystalline prism array reflector and telephoto high speed CCD. At the same time, the scintillometer was used to monitor the changes of turbulence intensity. Firstly, the intensity distribution of the obtained laser spot image is analyzed intuitively. The difference of the laser spot pattern under different turbulence intensity is compared. Then, the probability distribution of the light intensity in the range of different turbulence intensity and different aperture is calculated statistically. The results show that the light intensity probability density function basically follows the lognormal distribution in the vicinity of the focal spot, but the area near the center of mass is in a higher degree, and its degree of compliance is negatively correlated with the size of the receiving area. At the same time, the turbulence intensity affects the difference of the normal distribution between the different positions of the spot echo plane and the different receiving area.