This experiment was to study the stress effect of chromium on the seedlings of cucumber, reveal thedamage mechanism of chromium on cucumber, and provide theoretical basis for forecasting of heavy metal pollution.Chromium solution of six concentrations（0, 0.5, 1, 2, 5, 10 mg/L） was adding to Hoagland’s nutrient solution, andeffect of chromium on cucumber seed germination and biomass accumulation studied. It was indicated that smallamounts of chromium promoted the germination rate, growth and development of cucumber seedlings, while the highconcentrations of chromium inhabited growth of cucumber seedlings. Under 0.5 mg/L of chromium solution, seed-lings growth was the best.