Abstract: The flavonoids were extracted effectively from purslane ，houttuynia，glycyrrhiza ，wild chrysanthemum ，pueraria，mulberry leaves，the flavonoids content is determined with colorimetric method；Iron element of the six kind of medical and edible plants were extracted with wet digestion method，and the iron content was determined with atomic absorption spectrometry ；Researched the correlation of scavenging effect of DPPH free radicals and flavones/iron content of the plants. The results showed the six medical and edible plants all contain a certain amount of flavonoids and iron ，and the scavenging effect of DPPH free radicals has a certain correlation with flavonoids and iron content.

Key words: Medical and edible plant , iron element , flavone , DPPH free redical