Abstract: The seeds of wheat and corn were treated by the water ethanol , or chloroform soluble substance extracted from pegamum harmla .The biological activities of the extractions were measured according to the seeds germination velocity and growth rate. The growth rate of the seeds treated by the three extractions were all improved. The best extraction to increase the growth rate of wheat was the extraction from water and ethanol. The growth rate of wheat treated by the extraction from ethanol was 91.03% for the root system,and 23.02% for the leaves, The growth rate was 68.99% for the root system and 17.04%for the leaves when wheat was treated by the extraction from water. For corn, the best extraction to improve the growth rate came from ethanol and chloroform. The growth rate of corn treated by the extraction from chloroform was 35.36% for the root system and 28.48% for leaves. It was 27.94% for the root system and 30.88% for the leaves when corn was treated by the extraction from ethanol. The correlations of the extractions to the germination of seeds are attributed to the chemical characteristic, concentration of the extractions, and time of germination. The extraction from ethanol inhibited germination of seeds more intensively than the extraction from water and chloroform. Low concentration extractions from water and chloroform generally did not show the inhibitory effect on the germination of seeds. However, high concentration extractions from water and chloroform showed variable degree of inhibitory effect and the inhibitory effect disappeared with the time of germination increase.