Facing the quickly changed generation, compared with the past principals, today's principals need to deal with lots of challenges with high difficulty, so it makes ”Principal Preparation” become the key topic. And various countries are devoted to promoting the professional ability of school leaders. The Britain National College for School Leadership (NCSL) is a national institute set up to cultivate school leaders. The successful experience may become the reference for our country to establish an institute of principal preparation. This article draws up from the Britain National College for School Leadership (NCSL) for passing through, and the institute of principal preparation for elementary and secondary schools of our country at present is the latitude. Also We try to propose the enlightenment by comparing two countries in institute's role, function, framework, training program, source of the funds, and the style.