Most of the geotechnical projects focus on assessing the existing ground and rock conditions. On some project, the soil condition may be poor, so we may have to consider the methods for soil improvement. Presently used techniques for ground improvement are removal and replacement of weak soils; grouting the weak soil, vibrocompactions, dynamic compaction, blast densification; insitu replacement of weak soils, stabilisation using admixtures, concrete soil reinforcement and use of geosynthetics such as geotextiles, geogrids, geowebs, etc. But these methods may be either expensive or time consuming. These may also prove a hazard to the environment.  This is a serious problem experienced by the civil engineers. To overcome this problem, we introduce the use of waste plastic materials for soil improvement. These can perform five primary functions such as separation between different layers, reinforcement, fluid barriers, protection of geosynthetics, erosion control. This technique is found to be simple, cost effective and does not require any special equipment. Also, helps to save our environment, as disposal of plastics is a problem creating environmental hazard.