The purpose of this research is determined the lexicon acquisition of children aged 3-5 years. The methods of this research are observation method and testing techniques. Observation method and testing techniques were conducted at play group and kindergarten. The test instrument uses pictures which are used to be learnt and encountered by the children in everyday life. These instruments are used to evaluate the lexicon ability of the children. The test results are saved in the video and recordings. In this test, researches recorded all observation qualitatively. The result shows that each age shows different phases. Based on the types of words, the Indonesian lexical tabulation has been acquired, i.e. nouns, verbs, adjective, and adverbs. The findings provide information about paralinguistic development phase of children in preschool age.