Surface Plasmon Resonance (SPR) is very sensitive to the change of the refractive index of the dielectric medium on
metallic films. Without labeling and purification the samples can quickly, real-timely and dynamically analyze
bio-molecular interactions. The biochip detection system based on SPR has been established to detect the
immunoreactions for the prepared bFGF protein chip, including the reaction between bFGF antigen and antibody,
between bFGF antibody and antibody's antibody respectively. After the immunoreactions occur on sample arrays the
refractive index as well as the resonant angle will increase. The reflected light images of the chips taken by the CCD
camera can determine the happening of the immunoreactions on the probes of the chips and the existing of substances
that are needed to be detected. SPR system can analyze qualitatively and quantitatively.