Deposit distribution pattern is an important index in aerial applications. A sensor with variable dielectric capacitor and network system is developed to measure the deposit volume near real-timely in aerial spraying application. The linear regression equations of output voltage and deposit volume with electric conductivity 487μS/cm and 25mS/cm are built by experiment with linear correlation coefficients of 0.9923 and 0.9544, respectively. The system is field tested in a spraying operation using aircraft M-18B and with nozzles AU-5000. The test result indicates that comparing with measurement method of water sensitive paper imagine analysis, the fitting degree of distribution pattern curve is 0.9146 and the relative measurement errors of deposit volume are in 10%~50%.