A high speed data acquisition system for precipitation detecting with linear CCD imaging technology based on ADC,FIFO and digital signal processor（DSP）was designed.The system can achieve data collection at the highest frequency of 16.6MHz with high stability.The data storage is completed at the same time when the processing cycle is proceeding.Signal conditioning circuit,data acquisition system,the hardware structure and logic control module are described in detail.The data processing algorithm and experience results are also given out.