Minle-Shandan M_S 6.1 earthquake occurred on Oct. 25, 2003. in west of Gansu province. Just before the earthquake 4 digital mobile strong motion instruments were erected in Hexi region, near the epicenter, by Lanzhou Institute of Seismology, according to the definite prediction opinion of the Institute. One instrument of them in Minle mobile station obtained the near-field strong motion seismic record of main shock. The distance to epicenter is 12.6 km. The maximum acceleration on direct EW is 331 cm/s²; on NS is 332 cm/s² and on UD is 209 cm/s². Furthermore some immobile strong motion stations in Hexi region (Shandan, Sunan and Wuwei)also obtained this event. In the paper the observed near-field frequency spectrum of main shock and the acceleration attenuation equation for Hexi region, Gansu province, are discussed based on the data of M_S 6.1 main shock and M_S 5.8 aftershock.