A new method of detecting body fluid is brought forward by studying the laser-induced spectroscopy (LIBS). The sample solution, which is comprised of 10% glucose and 0.9% NaCl, is broken-down by focusing the 1. 064 μm Nd:YAG laser beam (energy ～300 mJ, frequency 10 Hz, pulse width ～10 ns). And the plasmas spectra are collected by an experimental setup including echelle spectrograph and ICCD. The experimental results show that the organic matter ( as glucose) and metal elements can be synchronously analyzed by LIBS and the metal elements are more sensitive than the organic matter. The results also indicate that there is the exponential relation between the intensities of characteristic spectra and concentration. These results provide some experimental evidences for extending this mothed to be a new way of accurately detecting trace element in body fluid.