Tunnelling ionization of atoms is one of the fundamental processes in strong-field physics. Since the benchmark theory developed by Keldysh, there are numerous works to investigate the strong-field tunnelling ionization. In this talk, I will present our recent experimental efforts on tunneling ionization in strong laser fields. First, we have measured photoelectron angular distributions (PADs) and observed that the yields of near-zero momentum electrons in strong-field tunneling ionization regime are much suppressed. We show that the tunneled electrons released in a certain window of initial field phases and transverse velocities are injected into the Rydberg elliptical orbits and become stabilized against ionization. Second, we have measured photoelectron angular distributions of noble gases in intense elliptically polarized laser fields, which indicate strong structure-dependent Coulomb asymmetry. We theoretically disentangle the effect of direct ionization and multiple forward scattering on Coulomb asymmetry in elliptical laser fields and quantify the roles of the ionic potential and initial transverse momentum. There is no evident initial longitudinal momentum spread at the tunnel exit according to our semiclassical simulation. At last, I will talk about the intriguing application using strong-field tunneling ionization.