To increase the refrigeration efficiency applying a simple construction is the main subject of research regarding pulse-tube coolers. This paper describes an inter-phasing pulse-tube cooler with a new phase controller concept for increasing the overall refrigeration efficiency. In this pulse-tube refrigeration system, there are two sets of coolers, one of which consists of a pulse tube and a regenerator. The pulse-tube hot ends of two coolers are connected by either an orifice valve or an on-off valve. The two coolers are operated at 180 degrees out of phase using one-valved compressor. By controlling either the mass flow rate through the orifice or timing for the on-off valve, the phase between the pressure and mass flow control each other, and could be optimized in the two pulse tubes. The performance of the inter-phasing pulse-tube cooler was measured and compared with other types of pulse-tube coolers. The equivalent expansion PV diagrams of each cooler are analyzed.