The role of Chromium stress on hydroponic peas（Pisum sativum L.） and effects of Chitosan（CTS） on peas under the chromium stress were studied.The results showed that germination rate,germination index and vigor index of pea seed decreased,MDA content and relative electrical conductivity of hypocotyls increased with the increase of the concentration of chromium stress in range of 0-200mg·L^-1.The germination of pea was significantly inhibited when the concentration of Chromium was 100mg·L^-1.The germination of pea was very significantly inhibited when he concentration of chromium was 200mg·L^-1.0.5% Chitosan could alleviate the toxicity of the chromium stress.