As quality is of life considered as a measure of clinical outcome that prioritizes client assessment itself and the effects of a disease, a life change or a treatment has on their daily life and their level of satisfaction and well-being, their evaluation allows obtain a safe parameter for implementing clinical interventions that may have more positive impact on the lives of these people. It is believed that investigate the QoL of a given population is a strategy that will enable to broaden the understanding of the problems experienced by patients in order to facilitate effective future interventions, improving the quality of lived days. This information can also be used to identify patients at higher risk of problems and thus anticipate interventions, contributing to health promotion thereof. Nevertheless, there is currently a growing interest in transforming the QoL in a quantitative measure. To this end, the measurement of quality of life through the perception of the patient has been recommended. Some studies indicate that the measurement of quality of life the mental patient is an indicator of the care he receives and that this issue should be included in the assessment and care planning. There are few studies witch accessed the influence of health intervention on patients 'quality of life, anxiety, and depressive symptom levels. With this brief contribution, we hope can deepen discussion regards public health and mental wellbeing, as well as the options of measurement instruments to assess mental health interventions and thus able to gather more arguments to answer the following question: What`s the best way for measuring quality of life in Mental health?