The invention discloses a cell reselection method which is applied to a base station. The method comprises the steps that the load state of the cell is determined; the cell reselection priority of the cell is determined according to the load state of the cell, and the cell reselection priority information of a neighbor cell is acquired; the cell reselection priority information of the cell and the neighbor cell are broadcasted to a user terminal; and a lighter load state corresponds to higher cell reselection priority. The invention further discloses a cell reselection method which is applied to the user terminal. The method comprises the steps that the cell reselection priority information of the current service cell and the neighbor cell is acquired when the user terminal is in an idle mode; and if the cell reselection priority is higher than the priority of the neighbor cell of the current service cell and the signal quality of the neighbor cell satisfies a requirement, reselecting to the neighbor cell is carried out. According to the invention, the load of each cell is balanced; service interruption caused by cell congestion is avoided; and the user experience is improved.