(一)审题：

　　1.先读题干信息，后读图表信息

　　2.看清楚单位，在写作的时候写进文章

　　(二)构思：

　　清晰的结构

　　1) general statement(1～2 句)

　　2) detail analysis(按照分类元素确定主体段个数)

　　3) summary (1～2 句)

　　(三)写作：

　　注意

　　1.时态多用一般现在时或一般过去时

　　2. 采用客观表述，避免主观色彩

　　(被动语态的使用)

　　3.层次分明，条理清楚(使用逻辑衔接词和转承短语)

　　(四)检查：

　　字数

　　单词拼写

　　单位

　　时态：(开头段永远是一般现在时)

　　语法：主谓是否一致，谓语是否缺少或多余，有没有连词等

    范文：

　　The table shows some details about underground railway systems in six cities, namely, London, Pairs, Tokyo, Washington DC, Kyoto and Los Angeles.

　　London was the first city that opened underground railways systems in 1863, while Los Angeles was the last one in 2001. As for the other four countries, all of them opened the underground railways in 1900s.

　　The route in London is also the largest, approximately 400 kilometers. Those of Pairs, Tokyo and Washington DC are between 100 and 200 kilometers. The lengths of underground railways are short in Kyoto and Los Angeles (11 kilometers and 28 kilometers respectively).

　　Tokyo with 155 kilometers of route has the largest amount of passengers (1927 millions). It is followed by that of Pairs, London and Washington DC. Passengers in Kyoto and Los Angeles are similar, around 50 millions.

　　In conclusion, the underground railway system in London is the oldest and the longest, while that in Tokyo serves the largest number of people. By contrast, Kyoto and Los Angeles have new and small size systems.