To investigate the flexural behaviors of RC slabs strengthened with textile-reinforced highly ductile concrete （TR-HDC）， the four-point bending test was carried out on one reference slab， one slab strengthened with highly ductile concrete （HDC）， one slab strengthened with textile reinforced mortar （TRM） and three slabs strengthened with TR-HDC. The effects of adding with or without PVA fibers and the mumber of layers of textile on the failure modes， load-deflection curves， flexural capacity， ductility factor， and strain analysis were studied. The test results showed that for the RC slabs strengthened with textile-reinforced highly ductile concrete， the cracking width and space of strengthened slabs were reduced apparently， which showed the characteristic of thin and dense. The flexural capacity of RC slabs strengthened with TR-HDC was greatly improved. The maximum increases in the cracking， yield and peak loads were 104%， 89% and 127%， respectively. The rupture of the textile in the TR-HDC strengthening layer reduced the ductility of the slabs. Therefore， the textile rupture should be avoided as much as possible in the practical project. Based on the plane section assumption， the formulas for calculating the flexural capacity and deflection of RC slabs strengthened with TR-HDC were proposed. The calculated results were in good agreement with the test results. It can provide the theoretical basis for practical application.