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More and more enterprises are going to expand the business to the Internet and mobile terminals, at the same time, they are unwilling to give up the traditional applications not written in java, so questions come. The author has a deep research on JNI in java during the process of solving problems. This article simply introduces the JNI technology, and combines with the concrete instance to complete JNI cross-platform calling for VC++ program that reflects the using value of JNI technology.

Road disease detection system is the process of obtaining road subgrade information detected by geological radar to consider user management. at the same time, the user can carry on the statistical analysis to obtain information. In the process of system implementation, Database is the foundation. Database design must be combined with the requirements analysis, in this way can the database design more reasonable. Thus, to establish a reasonable, feasible database is crucial for the realization and application of the system, this paper mainly discusses the system database.

Ground penetrating radar (GPR) is a kind of geophysical instruments, which has been widely applied in geology, engineering, resource, environment, military etc. The method mentioned in this paper based on QR decomposition, by solving equations to find the estimated value of the radar wave velocity. This method delivers the features of real-time, accurate, and the accuracy required is not high. It is suitable for real time estimation of GPR detection. By estimating the wave velocity, we can identify the spatial location of underground target. This method provides a convenient way for the detection of underground target.