With the orthogonal designing method, the plants of the same variety of Broadbean (Vicia faba L.)were treated with heavy metal ions Pb 2+ , Cd 2+ , Hg 2+ , Zn 2+ in successive four generations. Parameters of quantitative characters(PQCs) such as the percentage of survival seedling(PSS), height of plants (HP), the relative time of first blooming(TFB), pods per seeding(PPS), amounts of bean every 20 pods (BEP) and weigth of 50 bean (WB) were investigated. The results showed that all PQCs ...