The invention provides a method through utilization of fast-growing herbaceous plants, of fast-growing alga, or lichen or moss to achieve carbon sequestration. The method includes a first step of planting and/or cultivating the fast-growing herbaceous plants, the fast-growing alga, the lichen or the moss in a selected land area or in a water area, a second step of carrying out harvesting or collecting when the fast-growing herbaceous plants, the fast-growing alga, the lichen or the moss grows to the appropriate height or the appropriate size after a period of time, a third step of carrying out drying on the harvested or collected plants, preferably, carrying out natural drying such as sun drying or air drying to obtain the dry plants, the dry alga, the dry lichen or the dry moss, a fourth step of transporting the dry plants, the dry alga, the dry lichen or the dry moss to a landfill and carrying out landfill, a fifth step of covering a layer of common soil on the final filled plants after the landfill is completed, and a sixth step of recovering vegetations in the landfill.