Based on bond graph theory, the bond model of a road smoothness measuring equipment vibration has been set up, and the state equation and the dynamic simulation program established.

Having nonlinear graph of data structure as model, this paper designs one city's tour-guide inquiring program and gives C alike algorithm of main program and key function.

In accordance with the characteristics and coverage requirement of path coverage test as well as the graph theory, this paper presents a new program control flow diagram model.