Abstract: The cold rolling deformation of the solid solution 00Cr22Ni5Mo3N duplex stainless steel with different deformation amounts of 40% -70% was carried out. The effects of cold rolling with different deformations on the microstructure and mechanical properties of the steel were studied by means of SEM, XRD, hardness test and tensile test.The results show that the microstructure of 00Cr22Ni5Mo3N duplex stainless steel after solution treatment at 1100℃×30 min is a two-phase structure of α ferrite and γ austenite. With the increase of the cold rolling deformation, the ferrite and austenite phase regions in the test steel are continuously elongated and thinned along the cold rolling direction, the microstructure is more and more refined, and the austenite is increasingly transformed into deformed martensite. After cold rolling, the hardness and strength of the solution steel are significantly improved, and the plasticity is significantly reduced.The hardness, tensile strength and yield strength of the 70%cold-rolled test steel all reach the maximum values, which are 470.4 HV, 1447.5 MPa, and 1195.8 MPa, respectively.