Proper operation of refrigerant distributors is essential for full utilization of evaporators with multiple circuits. The most common principle to first generate fully homogeneous flow after expansion valve and then distribute fluid into numbers of “feeder” tubes. Imperfect selection of the parameters can affect the uniformity of distribution. This paper presents experimental evaluation of distribution with visualization of the flow through distributor and feeder tubes. The entire line between expansion valve and evaporator (distributor and feeder tubes) are all transparent. The operation in this research was conducted in real 4-5 kW R134a system. The mass flow rate and inlet quality for each evaporator circuit are measured under same superheat, which represent the uniformity of distribution. Combining this quantitative mal-distribution with the visualization result, it offers a deeper insight into the mechanism of distributor performance.