and medium enterprises in Algeria after the Corona crisis, which was a strong shock that greatly affected the economy in general and its small and medium enterprises in particular. Study design: The study was divided into two axes, the first concerned with the theoretical framework of small and medium enterprises and their importance, as well as the Corona virus and its reality in Algeria, while the second axis was devoted to studying the negative effects of each of the Corona virus and the precautionary measures applied to reduce it on the economy, small and medium enterprises, as well as the various opportunities available from this crisis to ensure an economy Better with more flexible and efficient SMEs. Results: Among the most important results reached through this study is that the CORONAVIRUS has not only negative effects on Small and Medium Enterprises, but there are many positive effects that were represented in activation of electronic commerce, teleworking, electronic payment, and encouraging industrial diversity in small and medium enterprises, and adopting The concept of social responsibility by this enterprises. Conclusion: as a conclusion of the study, it can be said that Algeria in the post-corona phase focuses on the aforementioned positive results and supports them, it will be able to turn the balance of Algerian economy for the better.