1. INTRODUCTION  
2. LAMOST MRS OPTICAL SPECTROSCOPY  
3. SELECTION OF EARLY-TYPE STARS FROM THE MRS DATABASE  
4. IDENTIFICATION OF Hα EMISSION STARS FROM LAMOST MRS SPECTRA  
5.1. Literature cross-matching  
5.2. Spectral type collection  
5.3. The IR test  
7. SUMMARY AND CONCLUSIONS  