Abstract: Based on analyzing students' homework,this paper investigates the type of wrongly written or mispro-nounced characters,which always are wrong or are forgot in reading disable children from grade two to grade five.We try to know the reason for reading disability from this.The result indicated that 1) the types of wrong are fivekinds,in which the similar in form mistake is main kind.2) With grade rising,the proportion of similar in formmistake is increased.3) Only in grade two the proportion of the homophonous wrong type is more than the proportionof similar in form mistake.We infer that reading disabled children become literate by graph,not by font and literalmeaning.Therefore,their entry in their psychological dictionary is very few and inaccurate.

Key words: reading disability, the way of being literate, remember by graphs