Epicyclic-type automatic transmissions are used in automobiles widely. There are many advantages of epicyclic-type automatic transmissions. It is composed more densely, smaller and provide higher gear ratio. We can get different output speed by actuating different clutches or brakes. There are a lot of patents for epicyclic-type automatic transmissions, but most of them tends to be three degrees of freedom automatic transmissions or using embedded clutches or brakes and other complex constructions. It is a better choice if we could use relatively simple manufacturing and control of two degrees of freedom and external clutches and brakes in the same multi speeds, speed ratio of the same premise. Therefore, this study aims to propose a set of design process for two degrees of freedom parallel-connected epicyclic gear automatic transmissions and computerize the process. First, we established the lever diagram for eight-speed automatic transmissions. By decomposing lever diagrams to all possible three-point lines, then composing four different lines to get all possible eight-speed automatic transmission constructions. Then, we use direct-member -number method to get member number of all constructions. Determining the possibility of configuring clutches and brakes, excluding the construction which can¡¦t configure the clutch and brake, establish the database can be configured. Finally, we determine a speed ratio for the eight-speed automatic transmissions, excluding the constructions doesn¡¦t match the appropriate gear ratios. Drawing the diagram which comply the restriction for eight-speed automatic transmissions. Keywords: automatic transmission, lever diagram, direct-member-number method, member number, configuration of clutches