A novel method is presented to measure LED′s luminous flux due to its small size and narrow beam.A compound parabolic concentrator is used to collect the lights from a LED in conjucntion with a detector which in turn measures the luminous flux.The feasibility is validated by simulating single ray with different angles and 3 types of LEDs with software simulation analysis.Furthermore,7 LED samples are tested and the performance comparisons with goniophotometer are performed,and the results demons...