An LED lamp includes a lamp body, a casing connecting the lamp body and a position post connecting the casing. The lamp body includes a plurality of lamp modules and at least a bracket. Each of the lamp modules includes a heat sink and an LED module attached to the heat sink. The lamp body can be arranged in multi forms by the at least a bracket connecting different numbers of the lamp modules together. The lamp body can have one of the following forms: an L-shaped form, a U-shaped form and a square, loop-shaped form.