Temperature anomaly and gas anomaly such as methane and carbon dioxide before earthquake have been recognized for years. Many researchers have studied temperature anomalies with satellite thermal infrared data, while the gas anomaly has only been derived from limited ground measurements, and it is still not applicable in large areas. Here MODIS (Moderate Resolution Imaging Spectrometer) thermal infrared data is used to study the temperature increase before the Ms 5.0 Taiwan earthquake on January 15, 2002, and MOPITT (Measurements of Pollution in the Troposphere ) data is used to study the CO total column concentration before the Ms 7.5 Taiwan earthquake on March 31, 2002. It is found that there existed both high temperature area and high CO total column area near the Ms 7.5 earthquake epicenter and these two areas located at the same place. It is considered that this CO increase was caused by earth degassing. When these gases emit to atmosphere, they will also lead to temperature increase under the atmosphere electromagnetic field.