Healthy male Wistar rats were prepared as model of precancerous lesion of gastric mucosa. The tongue, pH of tongue surface, dropped cells from tongue fur, histology of tongue. and corresponding gastric mucosa, pH of gastric juice, mucosal histological changes in both groups were observed. Results revealed that, in the rats with precancerous lesion, the tongues were bare or only with little fur, dark purplish tongue with petechia. pH of both tongue and gastric juice were high, which were both coincided with the syndrome type of asthenic gastric - qi and blockage of collaterals by stagnant blood.