Abstract: Orthogonal test scheme L16(45) was designed in this study using three factors of water content, dry density, and calcium chloride content, to conduct an experimental study on the thixotropy of remolded loess in Tongxin Conty, Ningxia. Based on the measurements and analysis, we derived an empirical formula for calculation of the thixotropy from these factors. Our experimental results show that in the water content range of 8-14%, the thixotropy parameter increases with the increase of age. It is increasing at a high rate initially and then a lower rate, and tends to be stable after 14 days, a period independent of the other two factors. Hence, this age can be used as the strength growing age of remolded loess. All the three factors are significant and by effect they are ordered as water content, dry density, and calcium chloride content. The analysis reveals that the measured thixotropy has a good correlation with the age and each of the factors, and that our formula has a good accuracy and can make reliable predictions. Thus, the results would provide useful information for design and evaluation of remolded loess foundation.