ExtEndEd AbstrAct:The aim of this work is to study the effect of nanomaterials on the properties of cement paste, the experimental program included three parts: a-two types of nanosilica, locally produced NS1 and imported NS2, b-nanoclay (NC) and c-Hybrid nanoparticles (NS1 & NC). In each part, cement paste was used with different percentages of nanoparticles. Compressive strength and drying shrinkage tests were applied in each part on the cured and uncured samples. The results showed that the compressive strength improved in the cement paste mixtures in the cured condition, the optimum percentages was 1% for NS1, 1% for NS2, 5% for NC, and 5% (0.5%NS1 & 4.5%NC) for hybrid nanoparticles. The drying shrinkage increases with adding nanosilica and hybrid nanoparticles, while it decreases when adding NC. key words: nanosilica, nanoclay, hybrid nanomaterials. THE RESULTS OF THE SPECIALISTS' AND SCIENTISTS' RESEARCHESMAchinE-rEAdAblE inforMAtion on cc-licEnsEs (htMl-codE) in MEtAdAtA of thE pApEr