The fluorescence spectral characteristic of tumor blood was studied by laser-induced fluorescence technology, and
compared with the fluorescence spectra of the same type healthy mice blood, the differences between them are distinct.
When the whole blood solutions were induced by 407nm laser, they radiate fluorescence band from 420nm to 750 nm,
which spectral peak located at 620nm. In high concentration solutions (blood concentration is higher than 4%), the
fluorescence intensity are lower than normal blood, but in those low concentration solutions (blood concentration is
lower than 2%) the fluorescence intensity of the tumor blood are higher than the normal ones. It is analyzed that the
change of the fluorescence characteristic between the tumor blood and the normal is caused by the concentration
difference of the tumor identification-porphyrin. The experimental results showed that the obvious difference of the
fluorescence spectral characteristic between the forepart tumor and normal blood can offer some value assistance to
clinical diagnosis on cancer.