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Pesticide pollution is an effective environmental issue throughout the world. In some cases, acute amount of different pesticides affected haematological changes of fish. The present study was designed to understand the sub lethal effects of pyrethroid cypermethrin. In this study Labeo rohita was subjected to the treatment with two sub lethal concentrations [1/5th,1/10th] of 96 hr LC50 cypermethrin for a total exposure periods of 10,20 and 30 days. During the experiment haematological parameters including RBC, HB, PCV, WBC, Lymphocytes, Neutrophil, Monocytes were found to decrease and MCV, MCHC, MCH were increased while compared to control. Results obtained in this study explained that sub lethal concentrations of cypermethrin stimulated stress and altered the haematological parameters of Labeo rohita.