Remediation technologies for soils contaminated by heavy metals have been rapidly developed under various conditions of soils. Most contaminated soils are remediated with the combination of at least more than two proper technologies including physical, chemical, and biological remediation methods as well as phytoremediation. When the phytoremediation was applied to the contaminated sites, hyperaccumulators were generally planted with somewhat limitation. Thus, transgenic plants have been developed to replace the specific hyperaccumulators with limited applications. The important properties of transgenic plants for metal phytoremediation are much higher metal tolerance and accumulation than general hyperaccumulators. On the other point of view, the removed heavy metals and metal-contaminated mixtures as the second pollutants are produced during the soil remediation processes. Therefore, environmentally-friendly remediation technologies should be needed to reduce amounts of contaminated by-products and to increase the proper utilization of remediated soils.