In making flour into chaothu pies，the temperature of the water to be added to the
flour has been decided，from experience，a ccording to whether the chaothues are fried，
steamed or boiled. People have found that a different water temperature brings different hardness to the dough and the cooked chaothu pies. We made an experiment，therefore，to find out the relation between the temperature
and the quantity of the water to be added to the flour，and the hardness of the dough
and the cooked chaothu pies. The material used was wheat-flour (hard flour) on the market. The measuring apparatus were a Bravender Farinograph and a curd-tention meter. We measured the hardness of the dough and the cooked pies that varies according
to different water temperature; we a1so examined how the dough was effected by the
ways of kneading and extending it. The result of our experiment is as fol1ows; when the water temperature is raised，the dough，though with more water in it，can keep proper softness，which enab1es us to hand1e it easi1y and the cooked chaothues to taste soft and good.