Abstract: Most conventional spacious solar photoelectric-detection systems suffer from unexpected stray light. This paper demonstrates the effects on photoelectric detection system bring out by stray light. On this foundation

build up evaluation index of stray light system

to search the reasonable programme to eliminating stray light. A detailed telescope system geometry model was created

and scatter models were created for telescope and enclosure components. By the means of designing the structure of main baffle

baffle vane and the coating technology. In order to verify the prosperity of structure that designed

we utilize software to analysis opto-mechanical model before and after eliminating stray light. The simulations shown that point source transmittance (PST) of the system was thus reduced by up to two orders of magnitude between 10-8 and 10-10. Meanwhile

the experiment obtained clean detection data which satisfies the system requirements. Stray light has been suppressed effectually

and so measurement precision was improved from detection graphics.