Abstract: For the problem of color been changed easily and complex stress issues of natural fiber fabric composite under practical working environment, anti-light color and mechanical properties under biaxial load was studied for three kinds of resin matrix composite ,and strain filed were characterized by using digital speckle correlation.The results showed that: both water-based epoxy resin plate and isocyanate resin plate showed orthotropy and elastoplasticity, while the performance of phenolic resin board is linearity and simultaneous brittle -fracture on both X and Ydirection ;biaxial value loading difference is related to the orthotropy; load changes in fracture direction have a negative impact on other direction at the moment of breaking and impact degree has a positive correlation with the loading values in fracture direction.Under Linear elastic stage，load and average strain atY direction are larger than X direction within the same test area at timebucket, for isocyanate and phenolic resin plate the strain filed at X / Y direction changes more smoothly than water-based epoxy resin plate. Anti-light color properties for phenolic resin plate is better than others, and light stability on apparent color for isocyanate plate has been enhanced by boiling and alkali treatment.

Key words: Digital Spackle Correlation method, anti-light discoloration, biaxial tension, Strain filed, Ramie fiber textile