A soft-and hardware scheme for a circuit board is presented for the signals processing system of a 1D FSSP(forward scattering cloud-droplet spectrum prober)-100.The system is composed mainly of a special single-board microcomputer,parallel interface element 8255 and a liquid crystal indicator,and responsible for collecting FSSP signals and processing them in a designed way.Further,the range of the device can be regulated through the processing borad.