Due to the limitation by the velocity of the laser′s tunable componen t,the tunable band of ladar contradicts with the pulse repetition frequency (PRF) in synthetic aperture ladar (SAL).Meanwhile,the swath of SAL is small because of the micro-meter wav elength.In order to solve these contradictions,this paper gives a novel imaging mode of SAL,whi ch combines multi-channel technology and scan mode imaging system,providing a wide -scene imaging. This system utilizes multiple channels and a few same lenses located in the azimuth direction, which provide spacial information with spacial filtering to remove the ambi guity caused by the low PRF in the Doppler domain.And then,by means of controlling the laser b eams which scan in different swaths,a better imaging width can be obtained in spite of accompan ying with a reasonable loss of resolution in azimuth.Then,spectral analysis (SPECAN) is ad opted to remove the ambiguity caused by the scan mode.As such,the image would focus in the Doppler domain.F inally,simulation with three lenses,e.g.,three channels,can reduce the PRF to be one third of t he constraint of the Nyquist theorem.The imaging experiment with numerical data validates the effectiveness of the proposed method.