Abstract: In all over the world there is 7.75 billion of human population. They need proper place for deification and urination to save humanity and environment. That safe place may be toilet. civilization began not with the advent of written language but with the first toilet.(Horan 1997.Altho, it is seen that much less that what is needed in the world toilet is available .It is found that approximately forty percent of the world population has access to flush toilets .so if you take approximately 3 billion people have toilets. There need 20 to 25 liters drinking water to flush toilet after use per day .that may be 75 billion liters .on other hand there is another problem to safe discharge of used water .to avoid these problems it is necessary that toilet bowls should be water efficient .I.e toilet bowls should be so designed that may use very little quantity of water (100 to 200ml) per flush .This may be achieved by changing the design of toilet pan.