  In this paper, we use three different kinds of observational data, including
130 strong gravitational lensing (SGL) systems, type Ia supernovae (SNeIa:
Pantheon and Union2.1) and 31 Hubble parameter data points ($H(z)$) from cosmic
chronometers to constrain the phenomenological model ($\rho_x\varpropto\rho_m
a^{\xi}$). By combining these three kinds of data (Union2.1+SGL+$H(z)$), we get
the parameter value at the confidence interval of $2\sigma$, $\Omega_{X,0} =
0.69\pm0.34$, $\omega_x = -1.24\pm0.61$, $\xi = 3.8\pm3.9$ and $H_0 =
70.22\pm0.86$ kms$^{-1}$Mpc$^{-1}$. According to our results, we find that the
$\Lambda$CDM model is still the model which is in best agreement with the
observational data at present, and the coincidence problem is not alleviated.
In addition, the $\Omega_X$ and $\Omega_m$ have the same order of magnitude in
$0<z<1.26$. At last, we obtain the transition redshift $z_T=0.645$. If the
transition occurs in $z>0.645$, it is necessary to introduce the dark energy
interacting with dark matter.
