Phytoremediation is a method to remove the pollutants in the soil. The plants are used to absorb the pollutants and take them away from the soil. The purpose of adding the soil amelioration is to change the property of the soil and the growing environment. With this, the plants’ absorption of heavy mental can be increased. water-quenched slag and BOF slag are the by-products of the process of steel making in China Steel. They are generally applied as building material、the base material of fertilizer and soil amelioration. In this study, the sunflowes are growed in the soil contaminated with cadmium. An abundance of three different kinds of soil amelioration (water-quenched slag、BOF slag、lime) are added to the soil. Through the abservation of the plants’ growing, the researcher can analyse the soil and the plants and investigate the vegetation rate and the value of absorption of heavy mental. The result shows that water-quenched slag helps the sunflowers develop best , followed by BOF slag and lime. The plants without any soil amelioration are the shortest. Cadmium in the soil also affects the growing of the sunflowers. The plants in the soil contaminated with cadmium are shorter than those in the soil without cadmium. It means the height of the sunflowers is influenced by cadmium. The sunflowers in the soil with BOF slag absort the most cadmium, and then water-quenched slag and lime. The sunflowers in the soil without any soil amelioration abosrt the less cadmium. The positive correlation is significant between the quantity of absorption and soil organic matter (p<0.05). Also, the positive correlation is significant between cation exchange capacity of soil and pH value(p<0.05). When the pH value is lower, electronegative of variable charges induces and brings CEC reduction in soil, and vice versa. The situation about the change of the pH value in the soil happens in the process of growing the sunflowers. In the plant, the root contains the most cadmium, follwed by the stem and leaves, the flower and seed contains the less. According to the result, the sunflowers without any soil amelioration grow baldy and even can’t bloom and seed.