The invention discloses a method for selecting a cell by a multi-mode wireless terminal. In a cell reselection process, the multi-mode wireless terminal firstly divides a cell which is in accordance with a cell selection standard S into a preferential network mode cell and a suboptimum network mode cell, and then a finally reselected target cell is determined by using fuzzy reasoning and fuzzy decision methods, wherein in a plurality of pilot frequency cells, participating reselection, with same frequency and same priority, fuzzy reasoning is utilized to evaluate five measurement parameters, namely, a receiving level value of each cell, a minimum required receiving level value in the cells, relative frequency shift, available uplink maximum transmitting power of a terminal and maximum radio frequency output power of the terminal, then, the requirements of a user on transmission rate and service instantaneity are integrated, an optimal target cell is selected according to a fuzzy decision result, and then the terminal is switched to the cell for residing. According to the method, the time of the switching process is short, seamless transition can be realized, user calls can be avoided being lost, a user is ensured to reside in the cell with the optimal service quality, and furthermore, the risk of missing the call during manual mode switching is eliminated.