General qualitative and quantitative characteristics of life strategy are determined and their influence on life contentment and mental health evaluated. Life strategy is considered to be an art of one's own life forming; its main purpose is the search and implementation of one's unique sense. The authors argue that responsibility level, the measure of life comprehension, system of values and attitudes are important characteristics of life strategy. The main indices of individual efficacy in life strategy are life contentment and mental health. The data of experimental research show that higher indices of life comprehension and general subjective control result in conscious or instinctive choice and realization of creative life strategy based on such values as love, beauty, creativity, good, development. Such persons are usually more content with life and possess better mental health.