To characterize the size distribution of aerosol particles, a measuring simultaneously method for aerodynamic diameters and optic diameters of the aerosol particles is studied, and then the classifying count principle is described. Based on large-scale programmable logic chips and dual-port high-speed large-capacity memory chips, a high-speed and large-capacity classifiying count storage for aerosol particles is designed by using a multi-channel storage technology. By combining with the functions of single pulse counters and characteristic signal classifiying counters, the storage can offer the capacity up to 65 535 channels, each of which can count to 65 535 particles with a operating speed up to 15 ns. The storage has a simple circuit,and its multiple channel circuits make only up of two MACH435 and two IDT7009 chips.The characteristics of aerosol particles with the sizes of 0.5~20 μm in air is counted,and the particle distribution spectra are obtained. As a key storage component of the aerodynamic particle sizer developed by our institute, this storage satisfies the requirements of the measurement in real time for the speed and capacity.