A terahertz quantum cascade laser, which is made in-house, has excellent device performance and is easy for integration and application. Terahertz wave emitted from the laser device can penetrate non-metal materials with little loss. A transmission imaging system with certain spatial dimension and resolution is built with the terahertz quantum cascade laser together with peripheral supporting optics and an array receiving module. Key parameters in the beam shaping are studied. A terahertz joint analyzer is developed by using the imaging system together with an all fiber terahertz time domain spectrum system based on photoconductive antenna. The terahertz joint analyzer can detect both terahertz imaging and fingerprints of objects hidden in non-metal packaging. The operation software of the whole instrument can control and monitor all the devices inside. The terahertz joint analyzer system offers a method of fast, intuitive and accurate location and non-destructive analysis for the detecting objects.