Abstract: Based on the research work of "the 8086C anti-compiling system", a kind of technique for data structure recovery is described. The key of this technique is to collect all the application information of each variable through reading the middle file produced by the symbol executing of the assembling code, and then to synthesize the information collected to make out the recovered symbolic table and to recover the variables data types. After making detailed analysis of the main data types of the C, more than 20 pieces of the rules for collecting and analyzing information are given.