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Taking magnitude 7.2 Mexico earthquake taken place in 4 April 2010 as a context, spatial-temporal analysis and spatial analysis were made respectively using the total electron content (TEC) data of the NOAA and AIUB. On the basis of reusing the "sliding mean-standard deviation" method, the peak value interval and the low value interval of the TEC of epicenter were contrived and utilized to analyze preseismic anomalies in this paper. From our analysis, these findings are as follows: I) The peak value interval was from 9:00 to 12:45 and the low value interval was from 18:30 to 22:15 every day for the 4 April 2010 Mexico earthquake. The 2 April has respectively the lowest value for the peak value interval before this earthquake, and the 3 April has preseismic maximum for the low value interval. II) By analyzing the TEC data of the NOAA and the AIUB, it can be always found that more obvious anomalies exist for the low value interval, however, less obvious or no anomalies appear for the peak value interval. III) Obvious TEC anomalies appear before the 4 April 2010 Mexico earthquake, the TEC anomalies from the 2 April to the 4 April should correlate with this earthquake. IV) Considering the data precision, it is difficult to find the preseismic TEC anomalies using the AIUB data. [ABSTRACT FROM AUTHOR]