Background: The western Sichuan Plateau is located on the southeastern margin of the Qinghai-Tibet.The loess-paleosol sequence distributed widely on the western Sichuan Plateau is among the best continuous records of the Quaternary climate and environment on the margins of the plateau.The new method and technology of OSL dating were developed and applied to Chinese loess in recent years.But there were less application to be attempted to the loess from the western Sichuan Plateau.Purpose: This paper attempts to date the loess from Ganzi area

Sichuan province

using a new method for OSL dating.A preliminary experimental study was conducted loess from on the Garzi-A section.Methods: The fine-grain quartz extracted from 10 loess samples was measured by SMAR protocols for a preliminary study of OSL dating.Results: The identical Deat thermal treat 200oC 260oC was showed in preheat plateau test using SMAR protocol for the sample 09GZA03.The dose recovery test in SMAR for the sample 09GZA03 showed a better recovery ratio when the artificial dose is lower than ~240 Gy.An obvious underestimation appeared when the lab dose is greater than ~240 Gy.Conclusions: Based on the results

the SMAR method was applied to fine-grained quartz extracted from 9 samples which sampled at 30 cm interval.Their Des and ages become large with deep.The results show that SMAR protocols are able to dating the ages of fine-grained quartz from Ganzi loess

but the measured ages can be underestimated when the natural dose is greater than 240 Gy(~55 ka in the loess).