In 1960s, mind map was used to help people with learning disabilities to optimize the way of taking notes and improve their memory. In the year of 1971, Tony Buzan put forward the concept of radiant thinking and mind mapping, he also published more than twenty books which includes Mind mapping, Mind Mapping-Radiant Thinking. Mind map is widely used in many fields, such as culture, business and education fields. The plots of the novel Harry potter are designed by J.K.Rowling with the method of mind map. In business field, mind map is popular with many famous companies. For example, Boeing Aircraft Company makes use of mind map to draw an aircraft maintenance workbook to enable employees to acquire knowledge in just a few weeks. Other big companies, like IBM, Hewlett-Packard, also use mind map for company planning, marketing management, staff training and so on.