Laser Z-scan technology is a favorable method to study the properties of nonlinear optical materials. The principles of laser Z-scan technology and the compositions of Z-scan experiment system are introduced. According to the features with plenty of data and high stability, the laser beam Z-scan system based on Labview is developed. The laser beam Z-scan experiment can be automatically controlled by the system, and the experimental data can be stored and processed. The results show that the system can greatly increase the test efficiency and stability.