1. INTRODUCTION  
2. INITIAL SAMPLE SELECTION  
2.1. CFHTLS and IMS Imaging Data  
2.2. Broad-band Color Selection  
3. MEDIUM-BAND SELECTION  
3.2. Medium-band Selection of $z\sim5$ Quasar Candidates  
4. SPECTROSCOPY DATA  
4.1. Gemini/GMOS Observation  
4.2. Magellan/IMACS Observation  
4.3. Supplemental Spectroscopic Redshift Sample  
5. RESULTS  
5.1. Spectroscopic Identification of Quasars  
5.2. Medium-band Color Selection and Its Efficiency  
5.3. SED-fitting and Redshift Measurements  
6. IMPLICATION ON THE QLF AT $z\sim5$  
7. SUMMARY