Detailed polarization observations are key to understanding long-standing questions regarding pulsar emission processes. Sensitive observations of the double conal pulsar PSR J0631+1036 by the Five-hundred-meter Aperture Spherical radio Telescope have unveiled unprecedented details of individual subpulses and frequency evolution of the mean pulse profiles. The four components exhibit distinct statistical properties of subpulse strengths, widths, and even polarization characteristics, which are related to the emission geometry and processes. Based on the frequency-dependent profiles, we estimated the emission heights for both the inner and outer cones and Lorentz factors of relativistic particles, and outlined their footprints on the polar cap.