of its fibrogenic activity"was prepared in collaboration with Professors F. Afendiyev and A. Akhundov. This article was devoted to the study of a very important topic for that period. The research work "Changes in the blood clotting system during surgery" has not lost its relevance today in terms of important innovations for medical science. Musa Abdullayev's scientific articles were regularly published in the journal "Hematology and blood transfusion" published in the USSR. One of his articles, entitled "Changes in the blood clotting system during blood donation in donors" attracted attention at the level of the former Soviet Union. Musa Abdullayev's article "Modified dried-sterile thrombin at the Azerbaijan Institute of blood transfusion and its application in the clinic" co-authored with Professor Huseynov is also fundamental research work in terms of its style and innovation spirit. For this reason, the results of the scientific invention of eminent scientists are still used in the medical world today for diseases of the nose, ears, and throat. In 1962, he defended his thesis on "Fibrinolytic activity of the blood system and changes in coagulation factors in patients before and after surgery" under the supervision of a corresponding member of the Azerbaijan National Academy of Sciences, Honored Scientist Fuad Efendiyev. In 1967, Musa Abdullayev defended his doctoral thesis on "Blood clotting in normal and some pathological conditions." 4 doctoral and 8 Ph.D. thesis were defended under the supervision of Professor Musa Abdullayev. In 1972, the selfless scientist wrote a book for medical students called "Clinical Interpretation of Laboratory Tests." Today, the book is used as a basic scientific basis for research by students of the Medical University. In 1972, Musa Abdullayev has presented his scientific book "Military Field Therapy" to the medical world together with Abbasov I.T. The scientific material he wrote in 1972 is still available to the medical community. For many years, Musa Abdullayev contributed to the history of medical science in Azerbaijan by publishing his scientific articles in the "Azerbaijan Medical Journal", especially his research as a blood specialist. Professor Musa Abdullayev wrote the section of "Blood Diseases" for the manual" Clinical Surgery". The services of Doctor of Medical Sciences, Professor Musa Abdullayev as a scientist are still important in the history of Azerbaijani medical science in the formation and special place of dozens of medical specialists in the world of science. The suffering scientist Musa Abdullayev with his short but meaningful life