The invention relates to a flowing
path system, which is used for a blood gas
electrolyte analysis instrument or an
electrolyte analysis instrument. The flowing
path system comprises a flowing path control part, a sampling part, a sample analysis part, a
reagent part and a gas source forming part, wherein the sampling part, the sample analysis part, the
reagent part and the gas source forming partare connected with the flowing path control part respectively; the sampling part is connected with the sample analysis part; the
reagent part comprises a reagent bag and a waste liquid bag; a reagententers the flowing
path system through the reagent bag, and flows into the waste liquid bag sequentially through the flowing path control part, the sampling part, the sample analysis part and the flowing path controlling part; the gas source forming part comprises a gas pump, a gas
storage tank and a pressure reducing valve; compressed gas enters the gas
storage tank through the gas pump; after the
pressure reduction through the pressure reducing valve, the gas sequentially passes through the flowing path control part, the sample analysis part, the sampling part, the flowing path control partand the reagent part; residue reagents in the flowing path
system are flushed to enter the waste liquid bag. The compressed gas is used for reverse flushing; most residue reagents in the flowing pathare cleanly flushed; the instrument has little crossed
pollution during the measurement of a plurality of samples; the performance is more stable.