Introduction: Mental Health is a very comprehensive term that different psychologists, psychiatrists, psychopaths, health experts have tried to define in their unique ways. But a single and best definition is well-nigh possible. The study of mental health has become the chief course of study of modern time in almost all the countries across the globe, especially in India, a fast-developing economy. Initially, a Ph.D. student joins the doctoral program with zeal to learn, discover, and contribute to the stock of knowledge. He/she does so out of creative urges, hidden potential and sometimes out of unemployability and good incentives provided by funding agencies. But afterwards, the existing research culture and practices impose on him several limitations and the student does not get the expected and required environment, guidance and support, supervision, etc. All this continue to burden his mind and consequently, the student starts showing declined motivation and interest in the study which further result in depression and fear of failure. Aim: In this study, the researcher wants to study the mental health of students about the research environment and other demographic variables in Haryana state universities. Methodology: A sample of 500 PhD students were taken by using random sampling. A self-prepared questioner in the form of google form was used for data collection. Result: The result of the study revealed that gender and year of registration were significantly affected mental health. On the other hand, it also revealed that marital status, stream and gender of supervisor was not significantly affected mental health. The study also showed a positive significant correlation between mental health and the research environment. Conclusion: After going through the research result investigator conclude that for improving the mental health of students, every institute should organise workshops, seminars and counselling sessions.