The aim of this paper is to find out flow pattern of air streaming past bluff bodies. From pressure profile it is possible to evaluate velocity profile. From pressure profile it has been measured pressure co efficient. To design tall building pressure coefficient is very much parameter. The instability of flow due to occurrence of point of inflection has verified. From literature review the result is verified. Kai Fan Liaw investigated in his thesis the flow pattern around bluff bodies and simulated the flow pattern of the bluff bodies like rectangular, cylindrical bodies. In this paper it has been represented the flow pattern around of bluff in a diffuser. Flow around rectangular square with x/H=1.5 the velocity ratio with varying y/H is matching with our result although in our experiment rectangular bluffs are 110 mm apart. Objective of this paper is to study the flow pattern between two bluffs which is essential to design of high rise tall tower and building. In this paper it has been presented pressure recovery in the diffuser with the presence of two bluff bodies.