This application provides a cell selection method, a cell reselection method, and a chip, to improve user experience. The cell selection method includes: A terminal device searches for a first candidate cell, and receives a system message of the first candidate cell, where the system message includes parameter information of the first candidate cell and bandwidth information of the first candidate cell, and the bandwidth information is used to indicate a bandwidth of the first candidate cell. The terminal device determines a cell selection reception level value Srxlev and a cell selection quality value Squal of the first candidate cell based on cell measurement values and the parameter information of the first candidate cell, and determines that Srxlev>0 and Squal>0. When the bandwidth of the first candidate cell is greater than a preset threshold, the terminal device camps on the first candidate cell.