Fault localization is an important step in debugging. It makes use of the information from the source code and testing to locate bugs in software. This paper presents a method using the information quantity of testing events, called SIQ (suspiciousness based on information quantity). SIQ adjusts the fault localization procedure dynamically according to the testing events and the execution information of statements. In a series of experiments and analysis, SIQ takes on excellent stability in multiple data sets and has better localization accuracy compared to several existing methods.