Abstract: Chiral Liquid Crystal Elastomers(CLCE),with their ability to selectively reflect specific wavelengths of light and exhibit excellent large-deformation capabilities,have gradually become a promising flexible reflective display material.Studies show that the optical coloration properties of CLCE are closely related to local strain,displaying a significant force-optical coupling effect.As a soft material,CLCE possesses viscoelastic characteristics,resulting in a time-dependent mechanical response during deformation.However,systematic research on the optical and viscoelastic coupling properties of CLCE under uniaxial and biaxial deformation conditions remains limited.In this study,using a multi-axial opto-mechanical testing platform,we systematically investigate the time-dependent characteristics of the reflection spectrum of CLCE under uniaxial and equibiaxial deformation conditions.By analyzing the spectral properties under stress relaxation and different loading rates,we propose an improved phenomenological model for CLCE based on the stretched exponential viscoelastic constitutive relationship.This model provides theoretical support and experimental insights for further optimizing the application of CLCE in smart optical devices.