一种低灌注下测量血氧的方法，用于血氧测量装置，包括步骤：系统上电后，先进行硬件初始化，CPU系统自检，和程序初始化；系统核心控制模块在数据采集、处理的具体过程中，对硬件进行不同的控制；系统通讯功能模块输出系统数据处理模块计算得到的血氧饱和度或脉率的结果或数据；还包括步骤：所述系统数据处理包括面积积分递归处理，依据存储在数据缓冲区中的实时采集得到的测量数据，在一段时间内对所述实时数据积分来计算所述血氧饱和度。 The method of measuring a low-oxygen perfusion for oxygen measuring means  comprising the steps of: system power  the first hardware initialization  the CPU system self-test and initialization procedures  core control system of the data acquisition module  processed particular process  the different control hardware  results or data communication system  the system function module outputs obtained data processing module calculates oxygen saturation or pulse rate  further comprising the step of: said data processing system comprising a recursive processing area integration  based on real-time data collection stored in the data buffer is obtained within a period of time to calculate the oxygen saturation of the real-time data integration