1. INTRODUCTION

2. DATA
2.1. The 2MRS galaxy catalog
2.2. The mock 2MRS galaxy catalog

3. THE MODIFIED HALO-BASED GROUP FINDER

4. TEST WITH MOCK CATALOGS
4.1. Completeness, Contamination and Purity
4.2. Halo masses of galaxy groups

5. THE 2MRS GALAXY GROUP CATALOG
5.1. Basic Properties
5.2. Comparisons with previous results

6. SUMMARY