In order to improve the performance of dynamite , a new high-precision multiple detonation velocity meter was designed .Fiber optical was used as the detonator signals received by the transducer .By peak voltage sample-holding circuit, the time between wave peaks of detonator signals obtained from fiber optical was identified , and the data were pro-cessed by FPGA.By this means, the test accuracy and stability of the system were improved , and the circuit design and debugging were simplified.In this paper, peak voltage sample-hold circuit and photoelectric conversion circuit were designed in detail .The precision of the system was comparatively analyzed combining with experiments and error .The results show that the system ensures a great improvement in accuracy .%为了提高炸药的性能，设计一种新型高精度多段爆速仪，以光纤作为传感器采集爆炸信号，通过峰值电压采样保持电路，保证了光纤获取爆炸信号波形峰值间的计时，并由FPGA进行数据处理，提高了系统的测试精度和稳定性，简化了电路设计和调试。文中对峰值电压采样保持电路、光电转换部分电路进行了详细的设计，并结合实验和误差对比分析系统的精度，结果表明本系统在精度上有很大的提高。
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