在对内燃机等往复式机械的振动信号进行测试分析时，对振动信号一般只视作各态历经的随机信号进行处理，而忽视了信号中明显的周期性，使得在这类测试中信号信噪比过低，严重影响分析结果的可靠性和准确性。介绍整周期采样的原理与实现，应用结果表明，本方法能有效地提高信号的信噪比。 When testing and analyzing vibration signals of reciprocating machines such as internal combustion engines, the vibration signals are generally treated as only stochastic signals going through various states, while ignoring the obvious periodicity in the signals, so that in such tests, the signal noise The ratio is too low, seriously affecting the reliability and accuracy of the analysis results. The principle and implementation of whole period sampling are introduced. The application results show that this method can effectively improve the signal to noise ratio of the signal.