The article deals with multi-word prepositional expressions in technical texts of Slovak National Corpus of the type: preposition v + noun + preposition k. Data are collected from the subcorpus prim-10.0-public-prf that comprises texts of the popular scientific style, scientific articles, studies, encyclopaedias. It is expected that the highest frequency of multi-word prepositional expressions would be in this subcorpus of technical texts because of informing; announcing new information, results; introducing new approaches and discussing. From the frequency list of multi-word prepositional expressions of the above mentioned patterns, 15 expressions were identified to fulfill criteria for multi-word prepositions, i.e. vo vzťahu k(u), v protiklade k(u), v prístupe k(u), v pomere k(u), v opozícii k(u), v kontraste k(u), v smere k(u), v relácii k, v kontrapozícii k, v protipóle k, v kontrapunkte k, v protismere k, v súvzťažnosti k, v nepomere k, v súvislosti k. The expressions were classified and analysed according to three groups using lexico-semantic approach, i.e. neutral relationship, comparing relationship and opposite relationship. Development of terminology on multi-word prepositional expressions in the Slovak morphology is included.