Ten Schiff base of triazole and thiadiazole have been synthesized for the first time. Their physical constants, UV, IR, 1H NMR, elementary analysis and biological activity were originally studied. It is found from the results of biological activity tests that some compounds have a good activity on plant growth hormone. The Schiff base of thiadiazole have a excellent activity on auxin, the Schiff base of triazole have a good activity on cyto...