The invention discloses a solar substrate with high fracture strength. The solar substrate according to the invention comprises an upper surface, a plurality of first protrusions and a plurality of first recess regions. The first protrusions are formed on the upper surface and each of the plurality of first recess regions being formed on the surrounding of the plurality of first protrusions, such that the deflection required to crack the solar substrate by bending thereto being increased in comparison with the solar substrate without the plurality of first protrusions and first recess regions formed thereon. By the combination of the protrusions and the recess regions, the fracture strength of the solar substrate is enhanced for enduring a high tension. |