Abstract: A parameter design method is proposed for the signal acquisition of tracking and measurement radar with pseudo-random number (PN) code modulated continuous wave. The method uses FFT algorithm to implement time-domain correlation between received signals and local regenerated signals by frequency-domain spectrum multiplication, so that the acquisition time can be decreased significantly, then introduces non-coherent integration to increase the signal to noise ratio for weak signals. Tong multiple trial is applied to make the probability of false alarm meet system requirement. Parameters determination method is proposed to select the times of non-coherent integration and the parameters of Tong multiple trial. Results of simulation verified that the proposed method can meet the predetermined probability of detection and false alarm under low signal to noise ratio.