a condensing system and method with a plurality of leds is disclosed . the leds are positioned on the same plane . a first condensing lens is disposed at front of each led , a second condensing lens is disposed at front of each first condensing lens , a third condensing lens is disposed at front of each second condensing lens , and a fourth condensing lens is disposed at front of all the third condensing lenses . after the light emitted by each led is condensed by the corresponding first condensing lens , second condensing lens and third condensing lens , the divergence angle of the light becomes smaller , forming a bunch of nearly parallel light beams . the bunches of nearly parallel light beams simultaneously transmit through the fourth condensing lens , and then combine . the condensing system can be used as the light source with imaging lenses disposed therebehind to form an imaging system .