Abstract: In order to collect milk yield data rapidly and accurately, avoid the measurement error caused by commonly indirect measurement methods used at present, a milk yield collection system based on mass measurement method was designed. A mass measurement device based on pressure sensor was placed under the milk container, and the measuring signal were transformed to digital signal by A/D module to obtain the milk yield data and upload them to host computer. In the system, CAN bus was used to connect the lower computer to host computer with self-developed communication protocol The test results show that the system has the features such as rapid collection, strong fault-tolerance, and the measurement error can be controlled less than 6% in the range from 5 kg to 35 kg.