For the stray light from an Extreme Ultraviolet (EUV) solar telescope in the ground experiment, a measurement system for the Point Source Transmittance (PST) was established based on the parallel light introduced by the rotary scanning mirror at various angles and the PST curves were applied to assess the stray light level. By analyzing the structure of the telescope and the measured PST curves, the first order stray light under a small angle range was proved to be the main source of stray light.To eliminate the stray light, the principles of the baffles were presented in details and the simulation modeling of the telescope with baffles was created by Tracepro software. The eliminating ability of the baffle was calculated and tested at different Bidirectional Reflectance Distribution Function (BRDF) values. The test results show that the baffles can block most of the first order stray lights,the intensity of stray light has reduced 3 orders of magnitude,and the corresponding veiling glare index is less than 3.65%. With the help of baffles, the EUV telescope performs near the diffractionlimited condition at UV band, and all the requests for the imaging test can be met.