Objective: Viscoelasticity is one of the fundamental properties of gel plaster matrix

it can be determined by measuring the rheological properties of gel plaster matrix.To investigate effects of various fillers on the rheological characteristics of gel plaster matrix. Method: Rotary rheometer was employed to determine rheological properties of matrix containing various fillers

including the complex modulus (G*)

the elastic modulus (G') and the viscous modulus (G″).The influence of fillers on rheological properties of matrix was investigated

the adhesion performances of matrix were considered

and a method for screening fillers with the rheological properties of matrix was established. Result: Both of G' and G″ increased with increasing of fillers concent

especially for micropowder silica gel.When the concent of micropowder silica gel increased from 1% to 5%

G' and G″ increased 99% and 130%

respectively. Conclusion: Rheological properties of gel plaster matrix can serve as guidelines for optimization of formulations of gel plaster.