The procurement system is a key means through which the client creates pre-conditions for successful achievement of project specific objectives. The use and the development of procurement systems in any construction industry are affected by various factors. Thus it is interesting to discover different systems used in different instances. This paper presents the results of a questionnaire survey carried out among major contracting organizations in Sri Lanka on procurement systems to discern the trend from year 1977 to 2000. The paper also sheds some light on the underlying factors that affected the changes in procurement systems in Sri Lanka during the period concerned.