Abstract In the formation of liquid drops, different kinds of liquids may have different outer profiles; the change of volume and shape in the process of drop formation can indirectly reflect liquid's physical and chemical properties, such as surface tension and viscosity, etc. Real-time detection the size of drops in the forming process is on the basis of drop analysis technique. Previous researchers have studied that optic fiber and capacitance drop sensor fusion technology can indirectly gain drop's form and the volume. This article is based on the optic fiber and capacitance drop sensor theory, designing the system based on the LabVIEW software to realize the LDF (Liquid Drop Fingerprint) data acquisition function. The experiment results show that the system can well realize the acquisition, compared with the traditional VC programming technology, this data acquisition system is high efficiency.