Distribution regularities of chemical elements in the microstructures of high strength TRIP steel, such as Si, Mn, Nb, V, Al, C, were investigated by the methods of electron probe, Therm-Calc and X-ray. The results show that the solubility of Si, V and Al in ferrite is higher than in bainite, and the solubility of Mn and Nb in banite is higher than in ferrite. Nb and Al with high C and N appetency distribute unevenly in monitoring zone. Carbon content of ferrite is approaching to equilibrium state. Carbon content of bainite is dissolving in over-saturation state. Carbon mainly dissolve in austenite, total carbon content in austenite is of 70% in TRIP steels.