This paper presents high-resolution (6 x 10 4 ), high S/N (200-500) spectra of three K-type chromospheric active stars, HR 5553, Eri and 70 Oph. The observations were made using an echelle spectrograph on the 2.16-m telescope of Beijing/Xinglong Station in 1995 and 1996. The atmosphere parameters and the abundances of 13 metals for these stars were determined from a detailed spectroscopic analysis and their magnetic field strength B and filling factor α found by the Stenflo-Lindegren method.