1. Introduction

2. Sample construction
2.1. X-ray cluster candidates
2.2. Constructing the optically confirmed cluster sample

3. X-ray data analysis

4. Results and discussion
4.2. Cluster sample with X-ray flux from the 2XMMi-DR3 catalogue
4.3. Analysis of the cluster sample with reliable X-ray parameters
4.4. LX-T relation of the cluster sample with reliable X-ray parameters
4.5. Distribution of the luminosity with redshift

5. Summary and outlook