A two-dimensional point Laser Doppler Velocimeter (LDV) is proposed for the velocity measurement of solid objects with a certain trajectory fluctuation. The arrangement uses several coherent beams generated by the same ruled diffraction gratings to form a two-dimensional detecting region with several groups of measuring volume array. The structure of the detecting region is adjusted manually in terms of the specific measuring conditions. When object trajectory fluctuation does not exceed the detecting region, the system effectively detects the velocities of objects. As compared to the beam expanded differential LDV, this type of instrument has a higher spatial resolution due to its small measurement volume. In addition, the system concentrates its energy upon the detecting point instead of the whole area, so it is more suitable for remote detection. The signal of scattered lights from the solid object is also analyzed and simulate. Experimental results indicate that the measurement result is in agreement with the simulated one, and the mean error of velocity is 1.63% by using the frequency spectrum correction algorithm. The presented system has a potential for realizing the velocity measurement of spatial objects with a certain trajectory fluctuation.