With the stress-controlled automatic GDS static triaxial gauge， the behavior of unsaturated reticulated red clay under proportional loading was studied through triaxial consolidation and drainage test at constant stress ratio for the remolded reticulate red clay with the same moisture content and dry density at different matric suctions. The experimental results show that： （1）The back pressure displacement of unsaturated reticulate red clay has an obvious turning point in the process of matric suction equilibrium at different constant stress ratios， which can be used as a marker to judge whether matric suction reaches equilibrium or not； （2）By comparing the relation curves of axial strain and time at different matric suctions， it was found that the increase of stromal suction caused the increase of axial strain； （3）Under the condition that the deviator stress remains unchanged， the increase of matric suction does not cause a significant increase of axial strain； （4）There is a linear relationship between the deviator stress and the net mean stress at different matric suctions， and its slope is approximate to the constant stress ratio； （5）A method is proposed to predict the radial strain of unsaturated reticulate red clay under proportional loading.