In internet of vehicle (IOV) system, vehicle-to-vehicle (V2V) data transmission is influenced by multipath interference, which often causes bad consequences. In order to improve the data transmission reliability, a new estimate algorithm is proposed, that is an evaluation algorithm for V2V communication reliability based on sample judgment and balanced modulation. This study structures a transmission channel model of V2V in IOV, and analyses the characteristics of multipath transportation of communication channel. The simulation result indicates that the above-mentioned reliability estimate method can get an even better accuracy of V2V communication transmission and better effect of communication channel balance. Meanwhile, it can also reduce the error code ratio of the communication and improve the communication quality.