The invention provides a probe composition and a detection unit. The probe composition reduces the deviation of the vane type probe, and improves the contact stability of the vane type probe and each electrode. The probe composition supports the vane type probe and the vane type probe and an electrode of a detected matter are electrically contacted, wherein the probe composition comprises a piece plate, a pin stop, a front end side contact load bearing part and a basal side contact load bearing part; the piece block integrally supports a plurality of probes; the pin stop respectively runs through a plurality of the probes and integrally supports and locates each probe; the front end side contact load bearing part is embedded with the detected matter side that is the front end side of the probes to bear a contact load when a contact of the probe front end side contacts the electrode of the detected matter; and the front end side contact load bearing part is embedded with the basal side of the probe to bear a contact load when a contact of the basal side of the probe contacts the electrode of a probe base side.