The dynamic wettability characteristics of an evaporating sessile blood droplet is analalyzed theoretically over a saturated porous flat plate, We find here the variation of dimensionless droplet base radius, the dimensionless velocity of dynamic apparent three phase contact line of the droplet, the dimensionless dynamic contact angle and finally the dimensionless volume with time.We use a Newtonian fluid for this present case, It is assumed that the rate of decrease of volume of the droplet due to evaporation is directly proportional to the contact radius of the drop.The flow within the porus substrate is solved by the help of the Darcys equations.The analysis is done for the case different suction rates of the porous substrate.