In this paper, the experiment of optoacoustic detection of stark spectroscopy for CH3C1 and CH3F molecules is described. This method has been compared with conventional optoeleotric detection. An optoacoustic signal is produced when a laser line coincides with a molecular absorption line which has been shifted by making use of stark effect, and is detected by a special microphone. The dependence of optoacoustic signals on sample gas pressure has been determined and derivative signals of a number of line components of CH3F molecule under the condition of 11500 V cm stark field and 150 mTorr pressure have been recorded. The experiment indicates that fche optoacoustic signal decreases rapidly when the pressure is reduced in order to apply high stark tield to the sample gas,and it limits to obtain higher stark field. Authors have discovered that under similar conditions the optoelectric detection has higher sensitivity and higher signal-noise ratio than optoacoustic detection. And yet the optoacoustic detection method may be improved undoubtedly by putting the laser closer to the microphone using higher laser power till the absorption saturated^ and reducing the gap between two stark electrodes.