1. Introduction  
2. Observations  
2.1. SSO 1m Observation  
2.2. CTIO 4m Observation  
2.3. The Combined Optical Data  
2.4. Completeness Test  
3. Cross-Identification of Stars in the Previous Surveys  
4. Reddening  
4.1. Early-Type Stars and Their Reddening  
4.2. Spatial Variation of $R_{V,cl}$  
5. Distance  
6. Photometric Diagrams  
6.1. PMS Member Distribution in Color-Magnitude Diagrams  
6.2. Two-Color Diagrams  
6.3. PMS Membership Selection  
7. Spatial Distribution of the PMS Members and Candidates  
8. Summary and Conclusion