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Based on the basic theory of rotating magnetic field ranging (RMRS), with the aid of finite element analysis software ANSYS, the research of influence of metal casing on Double horizontal wells electromagnetic ranging radial distance calculation. Initially, SAGD double horizontal well RMRS downhole transmission model is set up, solving the model by setting unit properties, division of grid, load boundary conditions. Then research the influence of casing thickness, diameter, and relative permeability on axial component of magnetic field of double horizontal electromagnetic distance measuring system. The results show that: with the increasing casing thickness, diameter, relative permeability, the magnetic induction probe received will gradually decrease, but the dual horizontal wells radial spacing calculated use still theoretical ranging guide calculation methods of homogeneous medium. This conclusion can be selected sleeve, the magnetic orientation of the instrument research and measurement data interpretation providing a theoretical reference.