Depending on the China Earthquake Network Center (CENC) measurement, the Yutian M7.3 earthquake struck at 5:19
pm on 12 February 2014. It happened in the Altyn Tagh fault zone. The cycle process of the tidal force of the celestial
body for the earthquake was calculated firstly in this paper. From the result, we found that the earthquake occurred at the
low point phase. Meantime, the OLR (Outgoing Long-wave Radiation) change was analyzed based on NOAA satellite
data around the time of the earthquake in the China area. The preliminary result shows that the OLR have changed with
the tide force changing for the earthquake. In temporal, the change went through: Initial OLR rise→strength→reaching
abnormal peak→attenuation→return to normal. In detail, the initial indication of anomaly was detected on 9 Feb (3 days
before the main shock) and the maximum reaches the value of 11W/m2 northward from the epicenter. And the anomalous
area of 10 Feb is closest to the epicenter. There are still many theoretical questions have to be answered. However, OLR
have become one of parameters used for precursor studies and the OLR early anomalies appearance of earthquakes.
As the second Chinese civilian high spatial resolution satellite, the ZY-02C satellite was successfully launched on December 22, 2011. In this paper, we used two different methods, subjective evaluation and external evaluation, to evaluate radiation quality of ZY-02C panchromatic image, meanwhile, we compared with quality of CBERS-02B, SPOT-5 satellite. The external evaluation could give us quantitative image quality. The EIFOV of ZY-02C, one of parameters, is less than SPOT-5. The results demonstrate the spatial resolution of ZY-02C is greater than SPOT-5. The subjective results show that the quality of SPOT-5 is little preferable to ZY-02C，CBERS-02B, and the quality of ZY-02C is better than CBERS-02B for most land-cover types. The results in the subjective evaluation and the external evaluation show the excellent agreement. Therefore the comprehensive result of the image quality will be got based on combining parameters introduced in this paper.