This paper studies the effects of binder and filler composition to the strength properties of non-cement polyester grout (NCPG). The binder consisted of unsaturated polyester resin whereas the filler consisted of fine sand and fly ash. The composition of binder-to-filler ratios investigated were 0.43, 0.67, 1, 1.49, and 2.3. The mechanical properties of NCPG were investigated through flowability and compression tests. The test results show that the use of polyester resin combined with fine sand and fly ash produces good quality grout with high flowable rate, rapid setting, self-consolidating and high compressive strength.