| variable | ADF test | Tcritical statistics | P value | in conclusion | |
| 5% | 10% | ||||
| LnGDP | −2.461 | −2.913 | −2.606 | 0.506 | unstable |
| LnSZZ | −2.062 | −2.913 | −2.606 | 0.261 | unstable |
| LnTRA | −1.839 | −2.913 | −2.606 | 0.261 | unstable |
| LnINDU | −1.954 | −2.913 | −2.606 | 0.306 | unstable |
| △LnGDP | −6.723 | −2.913 | −2.594 | 0.000 | stable |
| △LnSZZ | −4.449 | −2.913 | −2.594 | 0.007 | stable |
| △LnTRA | −7.789 | −2.913 | −2.594 | 0.007 | stable |
| △LnINDU | −14.337 | −2.913 | −2.594 | 0.000 | stable |