Automatic placement was carried out using domestic dry fibers. The process parameters for the automatic placement of domestic dry fibers were formulated and verified. The laying quality of layer skipping was investigated. A T-shaped stringer preform was prepared. Vacuum-assisted molding was performed on the preform with layer skipping laying and the T-shaped stringer preform. Metallographic microscopic observation and ultrasonic C-scanning were conducted on their molding quality. The results show that the automatic placement preform of domestic dry fibers can achieve effective automatic placement preforming. The automatic placement preform of domestic dry fibers has good infiltration characteristics and can meet the process requirements of vacuum-assisted molding. The vacuum-assisted liquid molding quality of the automatic placement preform of dry fibers after the optimization of the resin flow channel design basically meets the requirements of molding quality.