Mineral resource is the important material basis of social development in China.Because of over-exploitation for long time,there are the problems of soil pollution and environment damage in mine area,and the idle discarded mining area is land waste.According to the problem of how to remediation soil of discarded mining land to improve ecological environment,our previous studies have found that the tropical energy leguminous tree species of Pongamia pinnata has a strong adaptability to the soil environment of vanadium titanium tailings,and heavy metals in the soil do not cause serious damage to the plants.Therefore,we tried to introduce Pongamia pinnata to the iron-vanadium-titanium oxide (V-Ti magnetite) mine area for improving mining ecological environment and using the abandoned mine land resources reserves biofuels raw materials.Pongamia pinnata has been planted at the V-Ti magnetite mine tailing damin Panzhihua for nearly four years.They have been well adapted to the mining environment and grown well.