In this paper an attempt has been made to study the effect of surface roughness on the squeeze film lubrication of partial porous journal bearing with micropolar fluid. On the basis of Christensen’s stochastic theory for the study of rough surfaces, the stochastic generalized Reynolds equation is derived for the micropolar fluids. Two types of one dimensional rough structures viz; longitudinal roughness pattern and the transverse roughness pattern are considered. It is assumed that, the roughness asperity heights are small as compared to the film thickness. The averaged film pressure distribution equation is solved numerically by using the conjugate gradient method. According to the results, the effect of micropolar fluid is to increase the film pressure, load carrying capacity and reduces the squeezing velocity.