Concurrent with changes in modern educational philosophy and methodology, 'open-plan' elementary schools are now coming to be more and more popular. In relation to this trends, this paper intended to point out the essentials for designing the open-space of elementary schools through the author's investigation to the seven typical open-plan schools. The results shows that 1) class spaces and open-space shall be used as one body, so both relation must be continuous. 2) there are many sorts of furniture in open-spaces. And these Quantities are eaual to the traditional class-room. 3) some specific provisions are formed in open-space, they are. For example, library corner, teacher's corner. Computer corner and the stock and display corner of printed materials. 4) open-space includes many of tables, and the number of their seats should be nearly the half of pupil's number.