The main objective of the study is the search of relationships between mood, personality traits and emotional intelligence (EI). The additional goal is acquisition of the new psychometric data on the used questionnaires. To measure mood, the Russian adaptation of the questionnaire PANAS was used, which assesses mood by the scales of positive affect (PA) and negative affect (NA). Personality traits were measured with the help of the Big 5 questionnaire, emotional intelligence was measured with the help of the questionnaire EmIn. Questionnaires were used on a sample of 71 subjects aged 18-49 years. Data was received about the reliability of the scales of all the used questionnaires, which in whole was satisfactory – Chronbach’s α of all the scales except one lie in the range from .78 to .89. Positive correlations of some scales of the EmIn questionnaire (general EI, interpersonal EI, management of emotions) were found with the scale PA and negative correlations were found with the scale NA. Scales of interpersonal EI and understanding of emotions had only positive correlations with the scale PA. Negative correlation of neuroticism with the scale PA and positive correlation with the scale NA were found. Extraversion was positively correlated with the scale PA and had no correlations with the scale NA. In whole the acquired results correspond to the results of the similar studies, conducted in other countries. The necessity to move from one-time measurements to data collection about participants’ mood for a long period of time (the so-called experience sampling) is validated. It will allow acquiring more reliable information about emotional background, characteristic for this or that participant, and analyzing relationships between personality traits and emotional intelligence, from the one side, and dynamic characteristics of emotional states, from the other side.