Intensity-modulated surface plasmon resonance (SPR) array sensor based on polarization control is introduced. The influence of incident angle, gold firm thickness, polarizer angle, wavelength and data processing on its sensitivity and measuring range is analyzed and sensor systems with wavelength set at 632.8 nm and 740 nm are experimentally studied. It is concluded that intensity-modulated SPR array sensor turns the polarization state change of light wave during the excitation of surface plasmons into intensity change to detect in an easily controllable measurement range. Using an appropriate parameter selection, high sensitivity can be produced with a simple optical and mechanical structure and lower production costs. This scheme can be widely applied to the high-throughput detections of bimolecular interaction analysis, environmental monitoring, food safety, pharmaceutical analysis, biomedical engineering and other fields.