Through experiments,the writer found that preparation in advance can help examinees improve complication,accuracy and fluency in grammar,while instant preparation can help examinees improve accuracy of oral expression and complication in grammar.

With the development of a flight preparation assisting system as an example,this paper gives a detailed account of the techniques and method of using electronic chart in general aviation flight preparation,including geographical information,navigational data and how to set up a performance databank for different types of aircraft as well as air route preparation and how to make flight plans,etc.