The Research examines the transmission advantage from Floor Trading (FT) to the Electronic Trading (ET) in the Iraqi Stock Exchange (ISE). Testing three hypothesis, first, test the significant different of market depth before and after period of ET used, second, test the significant different of market liquidity also before and after period of ET used. And third test the impact of market depth and liquidity on the performance of ISE. AnEvent Study is depended with 74 observing distributed equality on research period which is extent among 2006 to 2012, Note that the event window is 5-7-2009.The Result of hypothesis testing explore that the all three null main hypothesis is refusing and accept the alternative of it's because the ET improve the market depth and liquidity and then this improvement effect onIraqi Stock Exchange Performance. The explanatory power of independent variable (depth and liquidity) increased from 35.1% at before ET period to 40.7% after ET period, and that means improve each of depth and liquidity is impact on market Index, So the performance of ISE improvement. Depend on this result the third null main hypothesis refused and accept the alternative hypothesis which is (there is significant impact of market depth and liquidity on the Iraqi Stock Exchange Performance improvement more at after ET usedthan before
