1 INTRODUCTION  
2 DATA  
2.1 Kepler photometry  
2.2 LAMOST spectra  
3 METHODS  
3.1 Binary system parameters  
3.2 Analysis of starspot signals  
4 RESULTS AND DISCUSSION  
4.1 Results  
4.2 Comparing the RMS and lifetime with the single star system  
4.3 The SDR of binary system  
5 SUMMARY