The effect of the different kind of glass fibres on mechanical properties of ultra-high performance concrete (denote as UHCP) is analyzed in the paper. It was the use two types of micro fine high-dispersible alkali resistant fibres that increase tenacity and prevent the formation of shrinkage cracks caused by tensions accompanying concrete curing. In fact the difference between them is, that while one kind of fibres is bound by one hundred pieces in strand, second is dispersed one by one on individual fibres. In this work, we are also focused on the grain fineness of the basic component of concrete and their effects on mechanical parameters such as compressive and flexural strength, elastic modulus or fracture properties. Comparative measurements with normal strength concrete (denote as NSC) with and without glass fibres are done as well. On the basis of the experiments performed, it can be concluded that the mechanical prosperities of studied UHPC are similar and no matter what kind of glass fibre was used. On the other hand, the addition of fibres in NSC, is found to be more significant.