An experimental study on the refrigerant-side pressure drop of slit fin an tube heat exchanger has been carried out. A comparison was made between the predictions of previously proposed empirical correlations and experimental data for the pressure drop on design conditions of condenser in micro-fin tube for R22 and Rl34a. Experiments were carried out under the conditions of inlet refrigerant temperature of $60^{circ}C$ and mass fluxes varying from $150;to;250;kg/m^{2}s$ for R22 and Rl34a. The inlet air conditions are dry bulb temperature of $35^{circ}C$, relative humidity of 40% and air velocity varying from 0.68 to 1.43 m/s. Experiments show that pressure drop for R134a was $22{sim}22.6%$ higher than R22 for the degree of subcooling $5^{circ}C$ For the mass fluxes of $200{sim}250;kg/m^{2}s$, the deviation between the experimental and predicted values for the pressure drop was less than ${pm}20%$ for R22 and Rl34a.