A high speed data acquisition and processing system based on clock network is developed aiming at the requirement of high speed data acquisition system in full waveform laser radars. The key techniques are studied in detail. Based on analyzing ChipSync technology and clock jitter, a high quality clock network management method based on PLL and clock buffer is proposed. By using the proposed method which is based on the active intervention of high speed ADC output on-line clock, the problem of multi-channel high speed data flip-latch is solved. Experiment results demonstrate that the realized system can reach the sampling rate of 1.2 GSPS and the Effective Number Of Bit(ENOB) above 8 bit.