Abstract:With the level variations of cAMP and cGMP in cat tissues as the csiteria,the meridianactions reaehing ofFructus Schisandrae ,Radix Stephaniae Tetrandrae and Herba Houttuyniae were studied tentatively in animal exper-iments. The result obtained in this way approximates to the understanding of the meridian reaching actions of Chi-nese medicinal herbs as approved by trditional Chinese medicine.