Pneumatic Refuse Collection （PRC） system and it's machinery components are briefly introduced, which is new means of the city refuse collection, and two equations which can be used in estimation of required pump house power and total construction cost of the PRC system are shown. And the economic feasibility of the system is studied at high density residential area in Seoul. In this work the PRC system is compared with the compactor truck collection system which has more advantages than the common truck collection systems and it becomes clear that the PRC system is more economical than compactor truck system in Korea, too; with 20 % of annual wage increasing rate the break even point comes after 4 year; with 10 %, it comes after 6.6 years; the PRC system has 40 years life cycle. And the time when the break even point would be on the first year is estimated to be 9 years after from now under 10 % wage increasing rate.