The influence of ion implantation on the state of surface microrelief of high-alloy steels has been studied. The relationships of the complex roughness parameter of 12Kh18N10T steel with the energy of particles implanted with molybdenum ions as well as of the microhardness HV with the depth of indentor penetration into the specimen implanted with molybdenum, yttrium, and molybdenum + yttrium ions are given.