Abstract: This study presents the coating uniformity using modified bio-polymer in a tangential fluidized bed coater via Taguchi’s method. The study focused on the implementation of coating uniformity using modified bio-polymer toward granular urea. In this study, efficiency of mass coating per granular urea was used as indicator for coating uniformity. A series of coating experiments were carried out to determine the effect of inlet air temperature, disc rotation speed and spraying rate to the efficiency of mass coating per granular urea. An orthogonal array, the signal-to-noise ratio and analysis of variance (ANOVA) were used. Besides achieving optimal parameters for the efficiency of mass coating per granular urea, the findings explain parameters that affect the results. The confirmation run had carried out to verify the conclusion from the variance analysis.