A spatial domain matched filtering method and an array receiver in a radio communication system are provided. The spatial domain matched filtering method includes the steps of receiving array digital signals; weighting the array digital signals to obtain digital beam output signals; evaluating power value of digital beam output signals and normalizing the digital beam output signals; evaluating a correlation coefficient reflecting the energy of an expected signal in each beam; wherein evaluating equations are:

##EQU1##

Coeff_i(k)=Coeff_i(k)+Coeff_i(k-1);

and outputting the digital beam output signal corresponding to the maximum correlation coefficient.