Abstarct: One of the important challenges in studying the dynamic of fluids on a micro scale is to study the process of droplet formation in the microchannel in order to control the size of the production droplets movement. Generally, in microfluidic devices, there are three major regimes for droplet separation, which include compression, dripping and jetting. In the present study, the numerical method of droplet production in a T-shaped microcanal has been investigated and the effects of the viscosity ratio between two phases, the ratio of the input flow rate of the two phases and the number of capillaries have been studied. In this study, the size of the droplet, the distance between the droplets, the frequency of droplet production, and the separation time are investigated. Modeling of fluid dynamics, formation and separation of ferrofluid droplets in oil is modeled by level set method, and the results of this study are compared with available experimental and numerical data. The results show that by decreasing surface tension and increasing the capillary size, the size of the drop and the separation time decreases and the frequency of droplet production increases. The length of the drop increases with increasing continuous flow, and increases with increasing dispersed flow rates. By increasing the ratio of the flow rate, the separation length increases and approaches the Jetti diet. As the viscosity ratio increases between two phases, droplets with larger droplets will be produced, and as the gap between the droplets increases, the droplet production frequency decreases.