To study the evolution laws and its suffered influential factors of thermal effect and shock wave generated by thermobaric explosive （TBX） explosion around the tunnel entrance， explosion experiments were carried out by varying the initial location of TBX relative to the tunnel entrance. Thermal effect parameters （e.g. fireball size and temperature）， and shock wave parameters （e.g. overpressure peak value， positive pressure duration， specific impulse and waveform）， were analyzed. Moreover， the propagation trace of shock wave inside the tunnel was analyzed in conjunction with the results of Trinitrotoluene （TNT） explosion experiments. The results indicated that， when the TBX charge was initiated at the tunnel entrance， both the thermal effect and shock wave effect in air explosion was better than that in a ground surface explosion. Regarding thermal effect， the height and peak temperature of the fireball generated by the explosion were approximately 2 and 1.41 times higher than that of a ground surface explosion， respectively. The peak temperature measured by thermocouples inside the tunnel was about 2.42 times higher than that of a ground surface explosion， and the heat flux density could exceed 19.3 times that of the ground surface explosion. The temperature increasement generated by the afterburning process of TBX indicated a positive correlation with the weight of TBX charge. Concerning shock wave， the overpressure generated by the afterburning process of TBX in air explosion at the tunnel entrance was stronger than that of the ground surface explosion. For air explosion， the reflection and superposition paths of shock wave were more sufficient. Compared to the ground surface explosion， the equivalent coefficients of overpressure peak value， positive pressure duration and specific impulse of the shock wave in air explosion were approximately 1.3， 1， and 1.1， respectively. The evolution laws of thermal effect and shock wave effect were influenced by the combination of the constraint from tunnel and the intervention of the ground. In air explosion， the constraint effect of tunnel was much more significant， so as to the afterburning effect. However， in a ground surface explosion， the intervention effect of the ground could weaken the constraint function of tunnel， so that the mixing between Al particles and air could be suppressed， resulting in a reduction of afterburning intensity.