A devastating MS7.3 earthquake hit the capital of Haiti on January 12

2010.Here TEC（Total electron content） data provided by NOAA is used to analyze the ionosphere change before Haiti earthquake.First time series TEC data from December 12

2009 to January 12

2010 is plotted

and the result shows the TEC value begin to increase 3 days before the quake

and it gets to the maximum value just 1 day before the quake;Second the spatial distribution of TEC map is plotted

and the result shows that the TEC anomaly just exists near the epicenter in the whole north and central America continent;Finally TEC data within 5 degrees around the epicenter is calculated

and it shows the TEC gets to the maximum value 1 days before the quake

and drops after the quake.So by analyzing from the temporal and spatial features

we consider that the TEC anomaly is related to the Haiti earthquake.